Gambas/libraries/gb.qt
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About
gb.qt is a Gambas library which provides functions for displaying and handling forms; it uses the Qt graphical library.
Related libraries:
- gb.qt4 is (presumably) specific to version 4 of Qt
- gb.gtk provides much of the same functionality using the GTK+ graphical library, but it appears to be less fully implemented
- gb.gui provides functionality common to GTK+ and Qt, and loads whichever system is currently in use
Events
form state
drag-drop
Some rules which seem to apply:
- The Mouse location (Mouse.X and Mouse.Y) is not updated while the mouse is dragging anything; you get the mouse's location while dragging from the Drag object.
- Normal mouse events are also not triggered while the mouse is dragging anything
- In order for any element (form or control) to receive mouse events while the mouse is dragging anything, the element's Drop property must be set to TRUE
- To get continuous updates on the mouse's movements, implement (control).DragMove and (form).DragMove. The control will only receive events while the mouse is inside it; the form will only receive events while the mouse is not inside another drop-enabled control. Use the form events to detect when the mouse has left the control area.