Description
Occurs when the mouse button is pressed.
Syntax
bforward = BUTTONDOWN (ctrlentID, ctrlclassID, xdown, ydown, xup, yup, ctrlkey, shiftkey, mousebutton)
Parameters
BUTTONDOWN accepts arguments for the following parameters.
| Parameter | Description |
|---|---|
| ctrlentID | Has the format WindowName.ControlName, where WindowName is the identifier of the window that contains the affected control, and ControlName is the identifier of the control. Notice that a period separates the two values. |
| ctrlclassID | The type of control that recognizes the event. The window control type is the only valid entry. |
| xdown | The x coordinate when the mouse button was pressed. |
| ydown | The y coordinate when the mouse button was pressed. |
| xup | The x coordinate when the mouse button was last released. A "-1" indicates that the xup value has no meaning. |
| yup | The previous y coordinate, when the mouse button last went up. A "-1" indicates that the yup value has no meaning. |
| ctrlkey | A "1" indicates that the control key was pressed when the mouse button was pressed. A "0" indicates that the control key was not pressed. |
| shiftkey | A "1" indicates that the shift key was pressed when the mouse button was pressed. A "0" indicates that the shift key was not pressed. |
| mousebutton | A "0" indicates that the left or center mouse button was pressed. A "1" indicates that the right button was pressed. |
Returns
True or false. If false, the program execution returns to the calling procedure. If true, the event processing goes to the next level.
