#include </home/zeitlin/src/wx/github/interface/wx/event.h>
ペイントイベントはウィンドウのコンテンツを再描画する必要があるときに送信されます。
The handler of this event must create a wxPaintDC object and use it for painting the window contents. 以下に例を示します:
void MyWindow::OnPaint(wxPaintEvent& event) { wxPaintDC dc(this); DrawMyDocument(dc); }
Notice that you must not create other kinds of wxDC (e.g. wxClientDC or wxWindowDC) in EVT_PAINT handlers and also don't create wxPaintDC outside of this event handlers.
You can optimize painting by retrieving the rectangles that have been damaged and only repainting these. The rectangles are in terms of the client area, and are unscrolled, so you will need to do some calculations using the current view position to obtain logical, scrolled units. Here is an example of using the wxRegionIterator class:
// Called when window needs to be repainted. void MyWindow::OnPaint(wxPaintEvent& event) { wxPaintDC dc(this); // Find Out where the window is scrolled to int vbX,vbY; // Top left corner of client GetViewStart(&vbX,&vbY); int vX,vY,vW,vH; // Dimensions of client area in pixels wxRegionIterator upd(GetUpdateRegion()); // get the update rect list while (upd) { vX = upd.GetX(); vY = upd.GetY(); vW = upd.GetW(); vH = upd.GetH(); // Alternatively we can do this: // wxRect rect(upd.GetRect()); // Repaint this rectangle ...some code... upd ++ ; } }
The following event handler macros redirect the events to member function handlers 'func' with prototypes like:
Event macros:
wxEVT_PAINT
event. Public Member Functions | |
wxPaintEvent (int id=0) | |
Constructor. |
wxPaintEvent::wxPaintEvent | ( | int | id = 0 | ) |
Constructor.