#Mouse coordinates in qt how to
#Mouse coordinates in qt install

This.update() //add the instruction to repaint the widget to a list of paint instructions Void MainWindow::mouseMoveEvent(QMouseEvent *event) always initialize your custom variables Ui->centralWidget->setMouseTracking(true) //have to set both ways in order to work properly, dont know why This->setMouseTracking(true) //this is required to read mouseMoveEvent xy-position Then, in the mainWindow class file (.cpp), make the following changes: #include 'QPainter' In the mainWindow header (.h), make the following changes: private: To determine the current mouse coordinates in your QWidget, you first need to override the default mouseMoveEvent.

#Mouse coordinates in qt how to

Possible usage for this is to create a point-and-click game or to determine hotspots in your own custom QWidget.īefore we get into any coding, please look at my Hello World Tutorial which shows you how to setup the minimum mainWindow widget.

By overriding any of these protected functions, you can customize how the QWidget operates.įor example, you might want to determine what the mouse coordinates are within your QWidget. QWidget has the following protected functions keyPressEvent, keyReleaseEvent, mousePressEvent, mouseMoveEvent, mouseReleaseEvent, paintEvent. The most common aspects of GUI interaction you might want to take over are mouse, keyboard, or painting events. One way is to override QWidget’s default events. But when you want to implement something that is really unique, then you’ll have to be able to engage the internal processes that make your user-friendly interactions so intuitive. They may provide very specific features and might suit your needs perfectly. In this example, the keyboard and a gamepad are used for moving the cursor.For the most part, Qt comes with a bunch of convenience widgets built on top of their own QWidget. Bind different input sources to these functions. The CursorNavigation attached object implements the functions needed for controlling the cursor. to forward selection from container, set this button to have the focus/cursor by default OR alternatively, we may define an escape target item, that receives the focus when leaving this scopeĬursorNavigation.escapeTarget: homeButton escape command would by default return the focus to the parent of this scope (optionally) once the cursor enters the scope, limit the movement to this item's children enable cursor navigation for the container define a container with cursor manageable contents combine existing focus mechanisms and cursor management to have cursor scopes Set this to true to include the item for cursor navigation. After installing the plugin is available to any project using that version of Qt.

#Mouse coordinates in qt install

Run make install in the build directory to install the plugin to Qt's plugins directory. Build the plugin and the demo application by building the project CursorNavigation.pro. InstallingĬursorNavigation is distributed as a Qt QML plugin. This means that inputs are directed on the item that has the cursor and that the cursor movement can be refined using Qt's FocusScopes.īy default, CursorNavigation uses they keyboard as input, but it also provides an API for using any kind of input source for control. Moving the cursor is also moving the active focus between the items. There may be one instance of the CursorNavigation backend per window and one item per window having the cursor.

The simpler 4-way navigation is well suited for traditional, rectangular and structured UIs, while the 360-algorithm allows moving freely to any direction. There are 2 algorithms for spatial navigation: 4-way and free-directional. Moving the cursor is handled by algorithms, and is based just on the location and geometry of the items. The framework's backend keeps track of the navigable items and their parent-child relations and position and geometry on the UI. How does it work?ĬursorNavigation works by allowing the developer to define individual QML elements as navigable. CursorNavigation ships as a plugin for Qt and is loaded by simply importing it in QML, usable right from the beginning of the ui development. qt's existing key navigation, where the navigation path has to be defined explicitly on a per element basis. Minimal configuration, in this case, would be in comparison to eg. The purpose of the CursorNavigation plugin is to provide a generic way of enabling cursor navigation in QML UIs with minimal configuration and ease of use in mind. In this case, it's more specifically a selector for individual UI elements, such as buttons, and not completely freely moving, like a mouse pointer. This module, the plugin and the examples are all very much work in progress, so changes to the code, naming and API are to be expected! What is it for?Ĭursor is an indicator for the target of user interactions in a GUI.