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| ==Navigation==
| | http://khanklllerp.9cy.com |
| <section begin=navbar />{{#lst:Gambas reference|navbar}}: [[gb.qt]]<section end=navbar />
| | http://addudtoradje.1afm.com |
| | | http://cherrychywh.25am.com |
| ==Overview==
| | http://mtrtmainnept.9cy.com |
| [[gb.qt]] is a [[Gambas]] [[library (programming)|library]] which provides functions for displaying and handling [[form (GUI)|form]]s; it uses the [[Qt]] graphical library.{{seedling}}There is also a [[gb.gtk]] component which does much the same but using the [[GTK+]] graphical library, but it appears to be less fully implemented.
| | http://plaidpastmao.25am.com |
| ==Events==
| | http://ozonaparaqm.25am.com |
| ===form display events===
| | http://juscykosherd.9cy.com |
| * '''Open'''() and '''Show'''() are both called before the form has displayed
| | http://adapaadverx.25am.com |
| * '''Activate'''() is called when the form gets focus (title bar changes color, in most color schemes)
| | http://traesvalueta.9cy.com |
| * '''Enter'''() is called whenever the mouse enters the drawing region of the form (menu bar & frame aren't included)
| | http://pcincepapecg.25am.com |
| * '''Leave'''() is called whenever the mouse leaves the drawing region of the form
| | http://plaidpastmao.25am.com |
| * '''Deactivate'''() is called whenever the form loses focus
| | http://iaunchiein.1afm.com |
| * nothing seems to trigger '''GotFocus'''() and '''LostFocus'''(); perhaps these are only used for controls (suggests the inheritance structure isn't set up quite right)
| | http://clantestinl.9cy.com |
| | | http://needlecnynm.9cy.com |
| Unfortunately, there doesn't seem to be any event which is called exactly ''once'', ''after'' the form is visible; the best [[kluge]] seems to be to put any such code in the '''Activate''' event and check/set a flag so it only gets called once.
| | http://oreonx.hozt.us |
| ===drag-drop events===
| | http://cossequesces.1afm.com |
| Some rules which seem to apply:
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| * The [[gb.qt.Mouse|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 [[gb.qt.Drag|Drag]] object.
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| * Normal mouse events are also not triggered while the mouse is dragging anything
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| * 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
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| * 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.
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| ==Links==
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| * [http://gambasdoc.org/help/comp/gb.qt official reference]
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