fltk::ShapedWindow Class Reference

Inherits fltk::Window.

List of all members.

Public Member Functions

void shape (xbmImage &b)
void shape (xbmImage *b)
 ShapedWindow (int X, int Y, int W, int H, const char *l=0)
 ShapedWindow (int W, int H, const char *l=0)

Protected Member Functions

virtual void draw ()

Protected Attributes

int changed
int lh
int lw
xbmImageshape_


Detailed Description

This window's shape is clipped to an area defined by the alpha from an Image object. Current implementation insists that this be an fltk::xbmImage, which limits you to 1-bit alpha which must be supplied by the program. It should not be hard to modify this on newer systems to accept an arbitrary Image.

The layout and widgets inside are unaware of the mask shape, and most will act as though the bounding box is available to them. Therefore this window type is usally sublassed or occupied by a single widget.

If the window will be short-lived and does not have to move, you may be much better off using an fltk::MenuWindow. This is a normal window but with no border and no pixels are changed unless you draw into them. Thus you can get arbitrary shapes by the simple expediency of not drawing where it should be "transparent".

The window borders and caption created by the window system are turned off by default for a ShapedWindow object . They can be re-enabled by calling void Window::border(bool set).


Member Function Documentation

void ShapedWindow::shape ( xbmImage b  )  [inline]

The alpha channel of the supplied image is used as the shape of the window. A pointer to the image is stored, so it must remain in existence until shape() is called again or the ShapedWindow is destroyed.

If you want your window to resize you should subclass and make a layout() method that draws a new image and calls shape().


Wed Jun 17 08:53:25 2009. FLTK ©2007 Bill Spitzak and others.
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