Class | Fox::FXDCWindow |
In: |
rdoc-sources/FXDCWindow.rb
|
Parent: | FXDC |
A window device context allows drawing into an FXDrawable, such as an on-screen window (i.e. FXWindow and its derivatives) or an off-screen image (FXImage and its derivatives). Because certain hardware resources are locked down, only one FXDCWindow may be locked on a drawable at any one time.
Construct a device context for drawing into a window (specified by drawable). If event is +nil_, the device context is constructed for normal drawing, and the clip rectangle is set to the whole rectange. If event is a reference to an FXEvent, the device context is constructed for painting in response to an expose; this sets the clip rectangle to the exposed rectangle. If an optional code block is provided, the new device context will be passed into the block as an argument and end will be called automatically when the block terminates.