View Source wxClientDC (wx v2.4.3)
wxClientDC
is primarily useful for obtaining information about the window from
outside EVT_PAINT() handler.
Typical use of this class is to obtain the extent of some text string in order to allocate enough size for a window, e.g.
Note: While wxClientDC
may also be used for drawing on the client area of a window
from outside an EVT_PAINT() handler in some ports, this does not
work on all platforms
(neither wxOSX nor wxGTK with GTK 3 Wayland backend support this, so drawing using wxClientDC
simply doesn't have any effect there) and the only portable way of drawing is via wxPaintDC
.
To redraw a small part of the window, use wxWindow:refreshRect/3
to invalidate just this part and check wxWindow:getUpdateRegion/1
in the
paint event handler to redraw this part only.
wxClientDC
objects should normally be constructed as temporary stack objects, i.e.
don't store a wxClientDC
object.
A wxClientDC
object is initialized to use the same font and colours as the window it
is associated with.
See:
This class is derived, and can use functions, from:
wxWidgets docs: wxClientDC
Summary
Types
-type wxClientDC() :: wx:wx_object().
Functions
-spec destroy(This :: wxClientDC()) -> ok.
Destroys the object
-spec new(Window) -> wxClientDC() when Window :: wxWindow:wxWindow().
Constructor.
Pass a pointer to the window on which you wish to paint.