Occurs when the mouse button is released over the object.
Object.OnMouseUp( enMouseButton, enKeyShift, fX, fY )
The OnMouseUp event syntax has the following parts:
|
Name |
Type |
Description |
|
Object |
An object |
A control or the AForm object |
|
enMouseButton |
Val enumAMouseButton |
An integer that identifies the button that was pressed (OnMouseDown) or released (OnMouseUp) to cause the event. |
|
enKeyShift |
Val enumAKeyShift |
An integer that corresponds to the state of the SHIFT, CTRL, and ALT keys when the button specified in the button argument is pressed or released. |
|
fX, fY |
Val APixel |
Returns a number that specifies the current location of the mouse pointer. The fX and fY values are always expressed in terms of the coordinate system set by the Height, Width, Left, and Top properties of the object. |
enumAMouseButton can be one of the following:
|
Name |
Value |
Description |
|
aMouseButtonLeft |
1 |
Left button is pressed. |
|
aMouseButtonRight |
2 |
Right button is pressed. |
|
aMouseButtonMIddle |
4 |
Middle button is pressed. |
enumAKeyShift can be one of the following:
|
Name |
Value |
Description |
|
aKeyShiftNone |
0 |
No key is pressed. |
|
aKeyShiftShift |
1 |
SHIFT key is pressed. |
|
aKeyShiftCtrl |
2 |
CTRL key is pressed. |
|
aKeyShiftAlt |
4 |
ALT key is pressed. |
Use a OnMouseDown or OnMouseUp event procedure to specify actions that will occur when a given mouse button is pressed or released. Unlike the OnClick and OnDblClick events, OnMouseDown and OnMouseUp events enable you to distinguish between the left, right, and middle mouse buttons. You can also write code for mouse-keyboard combinations that use the SHIFT, CTRL, and ALT keyboard modifiers.
The following applies to both OnClick and OnDblClick events:
If a mouse button is pressed while the pointer is over a form or control, that object "captures" the mouse and receives all mouse events up to and including the last OnMouseUp event. This implies that the fX, fY mouse-pointer coordinates returned by a mouse event may not always be in the internal area of the object that receives them.
If mouse buttons are pressed in succession, the object that captures the mouse after the first press receives all mouse events until all buttons are released.
If you need to test for the button or shift arguments, you can use constants listed in the table above for enumAMouseButton and enumAKeyShift.
The constants then act as bit masks you can use to test for any combination of buttons without having to figure out the unique bit field value for each combination.
Note: You can use a OnMouseMove event procedure to respond to an event caused by moving the mouse. The button argument for OnMouseDown and OnMouseUp differs from the button argument used for OnMouseMove. For OnMouseDown and OnMouseUp, the button argument indicates exactly one button per event, whereas for OnMouseMove, it indicates the current state of all buttons.
chk1.OnMouseUp(nButton, nShift, x, y)
{
If nButton = aMouseButtonLeft
then ....
endif
}
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