Qt mouse event. QMouseEventTransition.
Qt mouse event. Qt mouseMoveEvent not firing when mouse pressed.
Qt mouse event If you touch some component inside the Flickable that is able to handle touch events, but then you drag your finger across the Flickable in the allowed direction, it uses childMouseEventFilter() to steal the grab from that I do have a 3d scene with Opengl, and I'm using the keyboard to move forward and backward, and the mouse pointer to change the direction. In addition we reimplement the close event handler to intercept the close events before terminating the application. QWidget::mouseMoveEvent not firing when cursor over child widget. What I mean by window however is a X. This page describes the original Qt Quick MouseArea type, which was initially designed to handle mouse input, and later began handling single-touch events (in the form of synthetic mouse events) in simple That's the point, you don't need to check; because you're implementing the mouse events in the class, you'll only receive the mouse events for the relevant class instance. When you call this handling mouse events in Qt Quick. Wheel events are generated for both mouse wheels and trackpad scroll gestures. 5. I want to receive its wheel events ahead of it, so that I can do some stuff as needed. On another est app I did used view mouse events, same situation. In Mode 2, I'd like to grab the mouse events at the Image level. 18. The example also demonstrates how to use QPainter to draw an image in real Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company +1 for try, but it's not what I need. Enabling Gestures. I think that If the mark it's only a picture, the relationship between the mark and the @Vicent. I cannot to handle double click event. handling mouse events in Qt Quick. The function pos() gives the current cursor position, while oldPos() gives the old mouse position. 14. How to hover event on label. Constructs a new mouse event transition with the given sourceState. @gde23. Qt: MouseMove not functioning. You can use this event to perform actions or update the widget's appearance in response to the mouse cursor's presence. Not receiving However currently I havent been able to get mouse events when my Qt application is not the active window. Ignore any mouse events in a widget over another one. Learn how to use the QMouseEvent class to handle mouse events in Qt widgets. 8k Views. I've Dialog that shows folders (in treeView) and files (in listView) respectively. I try to do this using following code class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); ~MainWi Qt: get mouse pressed event even if a button is pressed. My main problem is that I don't really understand how mouse events work in Qt. If that QWidget accepts the event then no further processing will take place. There are a few similarities between the events QEvent::HoverEnter and QEvent::HoverLeave, and the events QEvent::Enter and Member Function Documentation QHoverEvent:: QHoverEvent (QEvent::Type type, const QPointF &pos, const QPointF &oldPos, Qt::KeyboardModifiers modifiers = Qt::NoModifier) Constructs a hover event object. 9. ) for a specific widget, even if the mouse cursor moves outside the widget's boundaries. 1 (in visual studio, but I tried the same on QT creator 4. Here's my setup: I have a eventFilter on my QTableWidget to handle both mousePress and mouseRelease events. Installing an event filter on QCoreApplication::instance(). Then it decides whether or not it'll handle the event. It jumps from place to place. Qt automatically grabs the mouse when a mouse button is Hello dvez43, In the Qt documentation says: "This widget receives all mouse events until releaseMouse() is called; other widgets get no mouse events at all. Mouse events in Qt. Mostly the touch events will be interpreted as left mouse clicks. 2024-12-13. catch mouseMoveEvent on Qt5's QQuickItem. Image is private within Scene and I don't want to In Qt, how can I ignore all mouse and keyboard events and later stop ignoring them? That is: click a button, ignore all events in children; click again, not ignore. When a QGraphicsView receives a QMouseEvent, it translates it to a QGraphicsSceneMouseEvent. MouseButtonPress event and double clicks deliver a single QEvent. It provides a convenient way to detect when a user is hovering over a specific element in your Qt application. I would like to do a rudimentary automation test of my Qt application. Hi, probably there is a better solution, but I would set a bool to true when mouse click happens, temporarily save the point as well, then compare the QPoints of mouse press and mouse release in mouseReleaseEvent and do what you want to do, if they don't match. Mouse Events¶. @gde23 said in Event when the QMouseMoveEvent is finished (released)?. Mouse events occur when a mouse button is pressed or released inside a widget, or when the mouse cursor is moved. The returned value is always Qt::NoButton for mouse move events. The red area has a well defined thickness(e. There are two solutions: Do not accept mouse press events, add event->ignore(); in mousePressEvent Is there a way to stop the mouse events from being called if I handle it through the touch events? I could set some internal state and block mouse events while handling touch events but that seems pretty sketchy. Add override to your function definition and dont forget to Constructs a new mouse event transition for events of the given type for the given object, with the given button and sourceState. Because of that, we can suppose that probably However currently I havent been able to get mouse events when my Qt application is not the active window. It was necessary to distinguish the list widget items, so the list widget signal itempressed was processed as a slot. @nance97 said in QWidget::mousePressEvent() not called:. mouseMoveEvent is not called. Qt will handle that for you. My camera class has a pointer to the view and inherits QGraphicsRectItem and is added to the scene in the main class. g. Take a look at the relevant part of the Qt documentation: QWidget / Events: In Qt, events are handled from child to parent. 1. Verify that your position and your boundingRect are where you expect them to be. and one more problem with it is it just give mouse transparency to area which is transparent not to full window, drawn area still have mouse. See also KeyEvent, WheelEvent, and MouseHandler. So maybee this is not a MouseMoveEvent but a MoveEvent? MoveEvent is triggered, when you move the whole item or widget. To intercept it Qt offers you a great functionalities. In Mode 1, I'm grabbing the event mousePressEvent at the View level. This makes it possible to render push buttons and comboboxes differently when the mouse pointer is over them. Share. QtWidgets. In your particular case the And in mainwindow. But yeah, normally you dont have to do things like this. I have a QTableView where a small mark appears if the mouse hover on active cell. Global event filters even see mouse events for disabled widgets. @#include <QtGui> I want to capture mouse event from one object(say upper button) in my qml file and pass the same mouse events to two objects(say upper button and also lower button) on some codition check like, when the buttons are overlapped and if the user pressed mouse event is on the left half of the button, the mouse event has to be passed to lower button I have a QListWidget with some content and active scrollbars. In addition to containing the item, scene, and screen coordinates of the event (as I'm trying to get the coordinates of various mouse events from a QGraphicsView, but I can't figure out how to trigger them. If your problem is not using GraphicsView Frameworks, but other part of qt, it's almost the same process : You can call : QWidget::setEnabled(false) //like Massimo said In order to reactive the widget, just detect press event inside an object in your application to be able to call `setEnable(true) on your widget ! Hope it helps ! ` Share. QGraphicsView doesn't like to propagate mouseEvents (I know there is something but cant remember the correct explanation right now). I am assured that there's built-in method for that purpose. Naturally, the mouse events, such as button presses and mouse IIRC Qt event delivery will deliver events to the specific child widget at the pointer location, thus you won't catch anything useful by reimplementing the mouse event methods in the parent widget like a QMainWindow. ; How to use QLineEdit::mouseMoveEvent() QLineEdit *lineEdit = new QLineEdit; Connect the mouseMoveEvent() signal to a slot Using PySide which is the Python binding of Qt 4. Determine mouse event: hover leave parent for child widget. In the constructor Something is blocking it. The type parameter must be QEvent::HoverEnter, QEvent::HoverLeave, or QEvent::HoverMove. Greetings all, As seen in the picture. However when dealing with the mouseMoveEvent I only get a stack overflow, most likely because the event is called infinitely many times once the mouse is at a certain location. Such an event filter is able to process all events for all widgets, so it’s just as powerful as reimplementing notify(); furthermore, it’s possible to have more than one application-global event filter. The items are well draggeble because of embedded MouseArea in the items. PySide2. This page describes the original Qt Quick MouseArea type, which was initially designed to handle mouse input, and later began handling single-touch events (in the form of synthetic mouse events) in simple The official way to make gestures out of mouse events in Qt is deriving from the QGestureRecognizer class, which allows to listen to relevant mouse events, set gesture properties accordingly, then trigger the gesture (or cancel it). 2025-01-13. Instead, the event is sent to the widget where the mouse event happened, that is QListWidget's viewport. If it doesn't want to act on it, it can ignore the event and the event will be passed to the parent. How it Works. How to get mouse move events even when no mouse button is pressed and how to get mouse release events and wheel events? If propagateComposedEvents is set to true, then composed events will be automatically propagated to other MouseAreas in the same location in the scene. If you are want to know the modifiers key state from a mouse click event, (QGuiApplication::keyboardModifiers(). Edit: in button. I'm developing an application on a small Embedding Linux device with Qt5. The mouse event flags provide additional information about a mouse event. Ask Question Asked 10 years, 11 months ago. Mouse move events will occur only when a mouse button is pressed down, unless mouse tracking has been enabled with QWidget::setMouseTracking(). selectively ignoring mouse events in Qt. It should be noted this may not reflect the actual buttons held I want to write simple Qt Quick app with draggable QQuickItems. The code shows that you didn't subclass QGraphicsView, but instead use one in your own widget. I attach a picture too, to visualize the problem. To avoid inconsistency and have a generic behavior that just ignores the OS and always does the same, you can set an internal flag and check it whenever is required: since the context menu event might take precedence, call a @Pl45m4 said in QWidget::mousePressEvent() not called:. The simplest way to go is to catch the events in the QGraphicsScene. When a mouse event is generated by Qt it is generally passed initially to the QWidget that was under the mouse pointer when the event was generated. does not get invoked when i click on the spinbox. I think the cellExited/itemExited signals are useful in their own right, and was slightly surprised that Qt doesn't provide them (but maybe I'm missing something). I was aiming for a more general solution. "Only visible widgets can grab mouse input. The class provides parameters such as button, modifiers, position, and device for different mouse actions. In the case of classes that inherit from QAbstractScrollArea, the mouse methods are transmitted to the viewport, so that object must be monitored. In fact, All the events mentioned in your question were sent to the viewport (since this is were the event A mouse event contains a special accept flag that indicates whether the receiver wants the event. Qt. It looks at the But under my widget third-party window is located. @Jan-Willem if i didn't set the table->setAttribute(Qt::WA_TransparentForMouseEvents); this , am able to edit the tablewidget in a requried cell where i select that cell from table by using mouse but i cant able to do mouse click events . Qt mouse co-ordinates on Label. I would say it is Qt bug (on window focus change the widget should release the mouse) which will appear only if combined with your buggy code. I believe this could be the reason why I am not getting the result I want. There it is handled with Qt's default behaviour, namely scrolling. button ¶ Return type: MouseButton. Qt delivers the event by calling the event() method of the target object ( mostly widgets) . For example, when I press one key on the keyboard, the program can simulate a mouse click event. When an event occurs, Qt constructs an appropriate instance of a QEvent subclass . event A pointer to a QMouseEvent object that contains information about the mouse event, such as the mouse position, button state, and modifiers. How to process qt mouse events in parent QWidget first, and then pass it to children? 9. – Qt automatically grabs the mouse when a mouse button is pressed inside a widget; the widget will continue to receive mouse events until the last mouse button is released. I have a program where I need to draw a shape on top of an image using a mouse click/drag/release. You should call ignore() if the mouse event is not handled by your widget. Scheduled Pinned Locked Moved Unsolved Qt for Python 3 Posts 3 Posters 1. In your setup, you have QMainWindow as the parent, and a QGraphicsView as its child. cpp, i have set setMouseTracking(true) , to get mouse coordinates when clicked. I tested under Windows Qt 5. A more modern way of handling events from all pointing devices, including mouse and touchscreen, is via Input Handlers. In my subclassed QGraphicsView I am getting mouse events. I want all mouse events to be processed by the parent. Mouse events occur when a mouse cursor is moved into, out of, or within a widget, and if the widget has the Qt::WA_Hover attribute. [virtual noexcept] QMouseEventTransition:: ~QMouseEventTransition Destroys this mouse event transition. Here follows an example for pan gestures only, just to give an idea of what has to be done. 3 as published by the Free Software Foundation. 11 ). In listView doubleClick signal is handled by a slot that Qt created while I used Designer with aproppriate slot to be implemented. 0. I have an extended QWidget object (which draws the cell images and some countour data) inside a QScrollBar. Every event on the QGraphicsView will be handled by the Qt::MouseButtons QApplication::mouseButtons [static]: Returns the current state of the buttons on the mouse. Qt mouse events not working in QGraphicsScene . Qt::MouseEventFlags QGraphicsSceneMouseEvent:: flags const. Qt-Right click mouseReleaseEvents aren't caught by eventfilter,other events though are caught. Mouse events occur when a mouse button is pressed and the ray traversing the view, originating from the mouse position intersects with one or more elements of the scene. I assumed, with this question here, you asked for an easier Qt way. Programming Is Like Sex: One mistake and you have to support it for the rest of your life. Qt Line Edit Mouse Move Event . That means, if you know the size of the widget (use for example QWidget::rect()), you can compute within the The QMouseEvent class contains parameters that describe a mouse event. Nokia Certified Qt Specialist. 2. User can zoom in/out the Image (QWidget size is changed according to the Qt::MouseButtons QApplication::mouseButtons [static]: Returns the current state of the buttons on the mouse. The problem is that in order to change the direction while moving, I have to release the pressed key on the keyboard, as in the most of cases the keyPressEvents somehow get over the mouseMoveEvents. It should be noted this may not reflect the actual buttons held Qt for Python; MousePressEvent on a QWebEngineView; QtWS: Super Early Bird Tickets Available! MousePressEvent on a QWebEngineView. See also Qt::MouseEventFlag and QMouseEvent::flags(). I tried implementing eventFilter and installing it on the said QListWidget, but to no avail: I only receive the desired event if it wasn't consumed by the scroll area, i. Edit: Btw, if you still want to stick to your solution, install the filter on the In qt widget QGraphicsView I want to detect mouse-press, mouse-release and mouse-move events. Qt MouseMoveEvent only triggers with a mouse button press. Send Mouse event to QML object. I derived a class from QGraphicsView and I have overridden the following functions:. I wouldn't put boolean for that matter, too risky when user is clumsy with mousehave noticed that Qt is not the very best with mouse event processing. Mouse move events will occur only when a mouse button is pressed Reimplement the QWidget event handlers, QWidget::mousePressEvent(), QWidget::mouseReleaseEvent(), QWidget::mouseDoubleClickEvent(), and Reimplement the QWidget event handlers, QWidget::mousePressEvent(), QWidget::mouseReleaseEvent(), QWidget::mouseDoubleClickEvent(), and Events are objects in your Qt C++ application, and they are indeed represented by the QEvent class. I've seen other questions similar to this say I need to enable mouse tracking, but setMouseTracking is in QWidget, and QGraphicsItem does not appear to be a QWidget. MouseButtonPress event closely followed by a QEvent. Property Documentation I overridden the mouse event function in a custom class that inherited the list widget and implemented the necessary functions there. It does But only if you click the spinBox Widget, not the lineEdit or something else. This is not a special feature of Qt, you can find similar behaviour in every other GUI APIs I know. Certain MouseArea and MouseEvent properties enable these gestures. This property holds the button that this mouse event transition is Is there a mouse event that can be triggers when the mouse is moving and hovering over something? I have mouseMoveEvent() on but it only seems to work when the mouse is clicked down. Under mac all mouse events under transparent part of panel i can get in main window mouse event function. Qt widget detects mouse events when cursor is not over the widget. In the end, I want to add a picture to the graphicsView and then draw on top of it. All do QT mouse event handling problem. Mouse events with Qt. don't receive mouse events, when hit on already created item then I mouse event is catch. I've googled for a while to solve this problem, it seems that need that when a mouse ( with press button ) is on top of tab, it gets activated. This is only a suggestion, but void QWidget::mouseMoveEvent(QMouseEvent *event) says: If mouse tracking is switched off, mouse move events only occur if a mouse button is pressed while the mouse is being moved. If the event is not handled by the scene, the view may use it, e. I'll try using delegates. But i get the mouse coordinates only when a click is made outside any button in the mainwindow form. Returns the combination of mouse buttons that were pressed at the time the event was sent. Normally this strongly depends on you touch-driver. 6. The QWidget @SteveFalco. I try to do this using following code class MainWindow : Qt double click check left button mouse. 4. Wheel events are sent to the widget under the mouse cursor, but if that widget does not handle the event they are sent to the focus widget. I've tried implementing an event filter in my main view that modifies the mouse coordinate received, creates a new mouse event and submits the new event to the widget. Qt automatically grabs the mouse when a mouse button is pressed inside a widget; the widget will continue to receive I'm working with a QDial object that is intended to be controlled with a mouse wheel, it works fine as such, emitting valueChanged() signals when necessary. If the mouse event is a tap ( press and release with out any move events) then the children of that widget should handle the event, if not, and the events describe a swipe, then the parent widget should handle the events. How is it possible. Ask Question Asked 14 years, 4 months ago. Improve this answer. Modified 5 years, 7 months ago. I would call it more than suspicious. So how can I make this work? Thanks. ©2024 The Qt Company Ltd. I want to use it to scroll a QWT plot. If someone was so kind and patient to explain me the basics of mouse events and gave me some tipps for the problem explained above, I would be very grateful. Well you won't get a signal because the mouse is not represented by a QObject, but the widget under the mouse cursor will receive an event Mouse events occur when a mouse button is pressed or released inside a widget, or when the mouse cursor is moved. R 1 Reply Last reply Qt mouse leave event while button is pressed. As the Qt documentation states for the release event: - For mouse release events this excludes the button that caused the event. How to simulate double clicking item in qlistWidget. But a problem is that mouse events are not fired into C++ code in virtual overloaded functions. But for some bizarre reason, when I apply this logic on a QToolButton (for showing some custom text popup on hovering over it), the button becomes invisible, although hovering over where it is supposed to be reveals the popup all right, and even the cursor becomes pointer as expected, given I set it like that for the button! @gde23. I would like to put a semi-transparent QToolButton on top of it, allowing users to click on the button (and set QDial value to a pre-defined number) while maintaining the ability to use the mouse wheel to control I have implemented a sort of gestures listener in the parent widget. Find out how to define mouse areas, enable gestures, and ac The Qt3DCore::QMouseEvent contains parameters that describe a mouse event. For example, user clicks on object and drag this object to another place of window. Distinguish between single and double click events in Qt. Follow edited Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Events can either be generated from within the application or as a result of some external activity. These values are always @MicHes said in How does Qt synthesize Mouse Events from Touch Events?: "Alternatively, you could synthesize the event yourself, and send it into the event system (instead of calling the 'click' slot). For example there is an event for when someone clicks on a button : I am trying to catch both keyboard and mouse events. Purpose. Captures all mouse events (clicks, moves, drags, etc. when i move mouse over qlable and i am able get debug output "MOUSE MOVE" when i press Skip to content. Specifically, Qt Quick provides the MouseArea and MouseEvent types that allow developers to define JavaScript callbacks (also called signal handlers), which accept mouse events within a QT mouse event handling problem. Returns the mouse event flags. I guess this has something to do with the fact that when a button is clicked, already a mouse event of some sort is being generated to handle that How do I detect a scroll event in a Qt widget?. 0 Hello, I am using QT 5. You dont need mousePress, QT mouse event handling problem. The better solution is to re-implement the mousePressEvent and mouseReleaseEvent in a QGraphicsView subclass directly. I think that the only ways to get the mouse position are: With a QTimer and QCursor:pos (); With a QWidget transparent to full screen For the moment I work in this way : send mouse clic at (132, 42) And I'll prefer work like that : send mouse clic at QPushButton named "myButton" With the second way, I can run my test on a server without screen. If you click the up and down buttons, it should print Mouse pressed (your code worked for me, at least). I think some of these posts I linked refer to 'window' as a QWindow inside the QApp. eventFilter on a QWidget with PyQt4. You can use Event filter to solve this. I have 3 events defined as follows: void mouseMoveEvent(QMouseEvent *eventMove); void mousePressEvent(QMouseEvent *eventPress); void Learn how to handle mouse events in Qt Quick using MouseArea and MouseEvent types. 16. This mark is a widget and emit a signal if hover, changing the selecion mode of the table when I drag over the I cannot to handle double click event. So far I have coded these functions: button() returns the mouse button that caused the event, which is why it returns Qt::NoButton; but buttons() returns the buttons held down when the event was fired, which is what you're after. How to receive Enter and Leave Events on a Mouse events with Qt. Hi, I made a custom FileDialog for my program, composed of a QWidget as the parent, 2 ListWidgets with custom Items, a couple of lineEdits and labels. The state of the keyboard modifier keys can Qt widget detects mouse events when cursor is not over the widget. S. The wheel event will be first sent to the actual graphics view widget. mousePressEvent(QMouseEvent *event) mouseReleaseEvent(QMouseEvent *event) mouseMoveEvent(QMouseEvent *event) I overridden the mouse event function in a custom class that inherited the list widget and implemented the necessary functions there. I also have a custom class for the QPushButton to handle mousePress and mouseRelease events. Mouse move events will occur only when a mouse button is pressed down, unless mouse tracking has been enabled with setMouseTracking(). If you're still unsure please add the code you've tried, as an edit to We reimplement it to set the Qt::WA_Hover attribute on QPushButtons and QComboBoxes. You will have to do the coordinate transformations yourself. mouseReleaseEvent should be triggered, if you release the mouse button. Qt MouseMove event not being caught in eventFilter() 3. Is there a solution? P. How I can do it? I tried mouseMoveEvent: void QDropLabel::mouseMoveEvent(QMouseEvent *ev) { this->move(ev->pos()); } but unfortunately object moves very strange way. I'm kinda new at PyQt and also at GUI programming. QRectF TreeViewNode::boundingRect() const {return QRectF();} This looks suspicious. Viewed 2k times 3 . I have tried using a QMouseEvent, but I could only find options for movement and pressing/releasing the mouse. Reply as topic; Log in to reply. It depends where you release the mouse. My goal to intercept mouse event and implement drag&drop and third-party window should not get mouse event in this case. I cannot modify his code. void Eventhost::mousePressEvent(QMouseEvent* event) { emit SignalControl(event); } This event gets sent to the widget where it is processed here; We reimplement the mouse event handlers to implement drawing, the paint event handler to update the application and the resize event handler to optimize the application's appearance. The problem with trying to track the current cell, is that there is no notification when leaving the viewport (because there is no You can declare MyButton as a friend class in MyWidget and then forward MyButton::mousePressEvent to MyWidget::mousePressEvent, and similarly for drag event. Qt mouseReleaseEvent() not trigggered? 0. If mouse tracking is switched on, mouse move events occur even if no mouse button is pressed. This page describes the original Qt Quick MouseArea type, which was initially designed to handle mouse input, and later began handling single-touch events (in the form of synthetic mouse events) in simple I am kind of new to Qt, I do not know if I am right or not. A mouse event is propagated up the parent This is the 'do it yourself' solution. The delay is approximately about 100ms on Windows. I am new to QT and looking for someone to help. I want to transfer a mouse event from one widget and execute it on another, I'm sending the mouse event through a signal. Image is private within Scene and I don't want to Enabling Gestures. More Mouse events occur when a mouse button is pressed and the ray traversing the view, originating from Mouse events occur when a mouse button is pressed or released inside a widget, or when the mouse cursor is moved. 3. I have another answer that demonstrates how to make a simple paint-like I want to simulation mouse event with Qt. Viewed 4k times 1 . Note: If a mouse event is propagated to a widget for which Qt::WA_NoMousePropagation has been set, that mouse event will not be propagated further up the parent widget chain. MouseButtonDblClick. Example code : from PySide. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1. How to execute the mouseevent of qgraphicsitem only ? (ignoring the rest of mouseevent of qgraphicsview) 4. Some mouse gestures and button clicks need to be enabled before they send or receive events. Subclassing QGraphicsView, custom mouse events. e 1 px movement) I notice that the cursor actually moves by 1 px, but the mouse event is getting triggered with the same previous position. If the event isn't accepted then Qt may propogate the event to that QWidget's parent and so on. I get mouser press events, mouse move events when mouse button is pressed and I get no mouse release events and no wheel events. To listen to (or explicitly ignore) a certain mouse button, set the appropriate mouse button to the acceptedButtons property. Any idea on how I can solve this issue? Is it possible to achieve what I want in any Mouse Event Handling¶ QML uses signals and handlers to deliver mouse interactions. Returns the button that this mouse event transition Mouse Events¶. Qt allows you to monitor the events using an event filter, so you can take advantage of this feature to emit a signal in a similar way to the previous solution. The current state is updated syncronously as the event queue is emptied of events that will spontaneously change the mouse state (QEvent::MousePress and QEvent::MouseRelease events). I set up some buttons on the central widget, I want them to have the right clicked event when right click each of them. Hi this i created separate class to implement mouse event on qlabel. When starting the automation, it reads the coordinates from the file, sends the appropriate mouse events and would do a pixel comparison with a previously saved screenshot. PyQt mouse events for QGraphicsView. Is that clear? I have the following lines, but maybe I'm doing something wrong: setAttribute(Qt::WA_TransparentForMouseEvents); setFocusPolicy(Qt::NoFocus); The official way to make gestures out of mouse events in Qt is deriving from the QGestureRecognizer class, which allows to listen to relevant mouse events, set gesture properties accordingly, then trigger the gesture (or cancel it). 3. but if i set this table->setAttribute(Qt::WA_TransparentForMouseEvents); logic am How is it possible to recognize it as a swipe gesture when the mouse moves? I'd like to receive a mouse event and send it to guestEvent(QGestureEvent*e), is If the event has not been handled by an object, it's propagated to the object's parent and so on. void TriangularGeometry::mousePressEvent(QMouseEvent *event) { m_color = Qt::black; update(); //changing an attribute of the qquickitem and updating the scenegraph } I can handle mouse events from the application but, as per my requirements, I need to handle it by overriding the method mousePressEvent(QMouseEvent *event). 11 Window, any application opened in X. Oldest to Newest. Qt Mouse Entry Event Explained . Property Documentation @summit said in How to receive mouse events for QDoubleSpinBox:. Documentation contributions included herein are the copyrights of their respective owners. And you can always get what kind of object is being watched by the event filter: bool MainView::eventFilter(QObject *obj, QEvent *event) { qDebug() << obj->metaObject()->className(); Why does this happens? If my understanding is correct, a mouse move event should happens when there is a change in the position; When I move the mouse in a very slow motion (i. Commented Jun 7, 2019 at 20:48 @JeremyFriesner. . How to use mouseEvent on QGraphicsView . Currently this is the closest piece of code I have to drawing the shape onto it however it is in QGraphicsView and I am unsure on how to detect a mouse click in that view. See also button() and modifiers(). I've implemented paint, and that's working. I have created a paint widget, that I want to implement a pan event with hand icon tool, which usually sees in many softwares. QT eventFilter with I used event filter to do so, and checking mouse events for scene and view and the problem is that if I press on transparent area then app. A mouse event is propagated up the parent widget chain until a widget accepts it with accept(), or an event filter consumes it. I need to be able to modify the mouse press coordinates received from Linux ( tslib ) in my application. It does not customContextMenuRequested is emitted when the widget's contextMenuPolicy is Qt::CustomContextMenu, and the user has requested a context menu on the widget. I'm running on Win7 64 if that matters. I am new in QT and I am trying to do something really basic, which consists in a graphic view object where I want to know the mouse position. Maybe that is worth looking into? A mouse event contains a special accept flag that indicates whether the receiver wants the event. The buttons() function will return the current state of the buttons, so since this is a release event, the code will return false, as it's no longer pressed. e. Oldest to Newest; Newest to Oldest; Most Votes; Reply. There are two ways to read the wheel event delta: angleDelta() returns the deltas in wheel degrees. And depending on your touch-driver somethimes you have to ensure that the touchdriver is calibrated in the right way ( for instance if the touch driver needs to know the origin of a touch event to get the right coordinates ). h: Set the widget mark like setWindowFlags(Qt::WindowTransparentForInput);, but I can't use it because I need hover event. mousepress(300, 400)). Getting position of mouse click in a QLabel. The pos is the current mouse cursor's position This is a very good answer. If you do reimplement this function, event will by default be accepted (see QEvent::accept()), and this item is then the mouse grabber. However, it is more difficult than I thought. Now that I'm capturing at View I can't get mouse events in Image. The problem is that I'm not able to handle RIGHT MOUSE click. That's why you catch several mouse events. Ask Question Asked 5 years, 7 months ago. need that when a mouse ( with press button ) is on top of tab, it gets activated. qlabel's mouseReleaseEvent() doesn't work properly. It records mouse events and writes them to a file (f. If I were you, I'd try to live with the Qt system. This page describes the original Qt Quick MouseArea type, which was initially designed to handle mouse input, and later began handling single-touch events (in the form of synthetic mouse events) in simple I have subclassed QGraphicsRectItem, and it's not receiving any mouse events. 5. Getting mouse click location of a label in qt. Modified 10 years, 3 months ago. That way it would never interfere when mouse-event handling. In Qt 5, QMouseEvent::source() was added to help you distinguish mouse events that were synthesized from some other device, by the operating system, by Qt or by the application; but then we found it to be both tempting and wrong to assume that such an event was synthesized from a touchpoint. Qt automatically grabs the mouse When I move the mouse in a very slow motion (i. I am able to get both KeyPress and KeyRelease events, but I'm only able to get MouseButtonPress events. Thank you. e. I must disappoint you, I am not aware of a way to make Qt switch its coordinate system easily. Qt Mouse and keyboard events are typically processed by the OS and then send to Qt which creates the Qt events. Categories; what platform are you on, are you a normal desktop application with a mouse input, what version of Qt are you using? S 1 Reply Last reply . testFlag(Qt::ControlModifier)) { // Do a few things } Otherwise, if you want to query explicitly the modifiers state you should use QGuiApplication::queryKeyboardModifiers(). I can get all events thrown by QWidgets except events arose by QPushButton and Widgets that implement the click event,I mean if I click on the background I can get the release event,if i click on a QLabel or a QWidget Container i still get the event, but I can't get mouse events from QPushButton, QCalendar, GroupBox etc Mouse Events#. , if it is already scrolled to its limit in the direction of mouse . Qt mouseMoveEvent only when left mouse button is pressed. Qt::MouseButton QMouseEventTransition:: button const. 10. The event is then forwarded to the QGraphicsScene associated with the view. QMouseEventTransition. Before I overloaded mousePressEvent in the View class I was able to get all events in Image. How to handle mouse Actually there is an even better option than using the mouse events of the parent widget: You can implement the mouseMoveEvent function of the child widget and get the QMouseEvent::pos() position which is relative to the top left corner of the widget. So in the constructor of your widget you can call setContextMenuPolicy and connect customContextMenuRequested to a slot to make a custom context menu. When this attribute is set, Qt generates paint events when the mouse pointer enters or leaves the widget. That's right, when you press/release your mouse button on the QListWidget, The QMouseEvent does not get sent to the QListWidget. " Ah yes. The state of the keyboard modifier keys can Rahul, what u did here has made window translucent even if we don't set transparentForMouse flag and also mouse events go through, but when we set flag "WindowStaysOnTopHint" transparency goes away. Mouse events QT. 5px). I have tried the code below, but when I press 'K', the program stops and gives me an error: The program has unexpectedly finished. Modified 14 years, 4 months ago. Just to move (0,0) from upper to I use Qt and I want to move some object with mouse. it is when user press on mouse button and hold it then move over within Qpainter canvas, the In other cases your widget regains focus and your widget still have a grab on mouse. Here's my sample code which displays the problem. Currently I have to override the methods in the QWindow derived class and explicitly send them to the parent, bus is there a simpler method to cover all events? Dragging, panning and mouse tracking items in Qt scene are the 3 actions which I want to simultaneously use in my app. First the child gets the event. , for the DragMode. – Jeremy Friesner. 8 I saw that single clicks deliver a QEvent. That way, you would also bypass the "hitButton" issue, as the button would just handle a mouse event. Qt MouseMove event not being caught in eventFilter() 5. The event() method doesn’t handle the event itself. Constructs a new mouse event transition for events of the given type for the given object, with the given button and sourceState. If you have more events to forward and don't want to implement many unnecessary methods in MyButton, you can reimplement QWidget::event in MyButton and forward specific events to QT mouse event handling problem. (Michael Sinz) 1 Reply Last reply . Creating Mouse Event for image labels in QT. If you press and hold down the mouse button on a widget then that widget grabs mouse events until you release the button. A mouse event contains a special accept flag that indicates whether the receiver wants the event. Click event for QGraphicsView Qt. Naturally, the mouse events, such as button presses and mouse I have 2 widgets, a parent and a child widget: Having access to the implementation of the red widget, is it possible to determine the moment when the cursor hovers out of the red widget into the blue widget without implementing any event handlers or deriving the blue widget?. Qt MouseMove event not being caught in eventFilter() 6. Viewed 11k times 2 I need to simply detect when the right button is pressed or released in my Qt5/C++ application every moment. Detailed Description. This topic has been The Qt's documentation clearly says the following about mousePressEvent method: The mouse press event decides which item should become the mouse grabber. Qt mouseMoveEvent not firing when mouse pressed. The general rule is that the context menu event is fired when the right mouse buttons is released on Windows and pressed on Linux.
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