/// <summary>
/// Repaints cursor on the screen.
/// </summary>
///
internal void RepaintCursor(Screen screen)
{
if (screen == null)
{
return;
}
// When RepaintCurosr() is called for root window of the screen
// (having no parent), we need to setup a default cursor (which is an
// invisible cursor at position ( 0, 0 ).
//
if (Parent == null)
{
screen.SetCursorPosition(0, 0);
screen.CursorVisible = false;
}
ClipContext clipContext = new ClipContext(screen, Left, Top);
clipContext.Clip(ClientWidth, ClientHeight);
if (children.Count > 0)
{
ActiveChild.RepaintCursor(screen);
}
else
{
if (CursorVisible && screen.IsVisible(CursorLeft, CursorTop))
{
screen.SetCursorPosition(
screen.Offset.X + CursorLeft, screen.Offset.Y + CursorTop);
screen.CursorVisible = true;
}
}
clipContext.Restore();
}
/////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Repaints window contents on the screen.
/// </summary>
///
internal bool Repaint(Screen screen, bool parentHasFocus = true)
{
if (screen == null) // FIXME: screen null OR INVISIBLE
{
return(false);
}
if (!Visible)
{
Invalidated = false;
return(false);
}
bool hasFocus = Parent == null || /* root window always has focus */
(parentHasFocus && Parent.ActiveChild == this);
if (Invalidated)
{
OnCalculateSize(hasFocus);
}
// Setup clipping region and drawing offset
//
ClipContext clipContext = new ClipContext(screen, Left, Top);
clipContext.Clip(ClientWidth, ClientHeight);
bool repainted = false;
bool drawBorder = false;
if (Invalidated)
{
// Setup default cursor position and drawing colors first, then
// erase background and draw contents
//
screen.SetCursorPosition(0, 0);
if (hasFocus)
{
screen.BackColor = BackColor;
screen.ForeColor = ForeColor;
}
else
{
screen.BackColor = BackColorInact;
screen.ForeColor = ForeColorInact;
}
ColorContext savedColor = new ColorContext(screen);
OnEraseBackground(screen);
savedColor.Restore();
OnDrawContents(screen, hasFocus);
savedColor.Restore();
drawBorder = true;
repainted = true;
Invalidated = false;
}
// Repaint children.
// Algorithm: At the beginning, 'repainted' flag is usually false.
// First child, which returns that it has repainted itself, turns-on
// 'repainted' flag further on so the all consecutive siblings are
// invalidated (and repainted).
//
foreach (Window subWindow in children)
{
if (repainted)
{
subWindow.Invalidate(); // Force child to be Repaint()-ed
}
if (subWindow.Repaint(screen, hasFocus))
{
repainted = true;
}
}
// Draw window edges (with parent's offset but without clipping!)
//
if (drawBorder)
{
clipContext.RestoreClipRegion();
if (hasFocus)
{
screen.BackColor = BorderBackColor;
screen.ForeColor = BorderForeColor;
}
else
{
screen.BackColor = BorderBackColorInact;
screen.ForeColor = BorderForeColorInact;
}
OnDrawBorder(screen, hasFocus);
}
// Restore clipping region and drawing offset
//
clipContext.Restore();
return(repainted);
}