private void PaintThemedButtonBackground(PaintEventArgs e, Rectangle bounds, bool up)
{
PushButtonState pbState = DetermineState(up);
// First handle transparent case
if (ButtonRenderer.IsBackgroundPartiallyTransparent(pbState))
{
ButtonRenderer.DrawParentBackground(e, bounds, Control);
}
ButtonRenderer.DrawButtonForHandle(
e,
Control.ClientRectangle,
false,
pbState,
DpiHelper.IsScalingRequirementMet ? Control.HandleInternal : IntPtr.Zero);
// Now overlay the background image or backcolor (the former overrides the latter), leaving a margin.
// We hardcode this margin for now since GetThemeMargins returns 0 all the time.
//
// Changing this because GetThemeMargins simply does not work in some cases.
bounds.Inflate(-ButtonBorderSize, -ButtonBorderSize);
//only paint if the user said not to use the themed backcolor.
if (!Control.UseVisualStyleBackColor)
{
bool isHighContrastHighlighted = up && IsHighContrastHighlighted();
Color color = isHighContrastHighlighted ? SystemColors.Highlight : Control.BackColor;
if (color.HasTransparency())
{
using Brush brush = new SolidBrush(color);
e.GraphicsInternal.FillRectangle(brush, bounds);
}
else
{
using var hdc = new DeviceContextHdcScope(e);
hdc.FillRectangle(
bounds,
isHighContrastHighlighted
? User32.GetSysColorBrush(ColorTranslator.ToOle(color) & 0xFF)
: Control.BackColorBrush);
}
}
// This code is mostly taken from the non-themed rendering code path.
if (Control.BackgroundImage != null && !DisplayInformation.HighContrast)
{
ControlPaint.DrawBackgroundImage(
e.GraphicsInternal,
Control.BackgroundImage,
Color.Transparent,
Control.BackgroundImageLayout,
Control.ClientRectangle,
bounds,
Control.DisplayRectangle.Location,
Control.RightToLeft);
}
}
private void PaintThemedButtonBackground(PaintEventArgs e, Rectangle bounds, bool up)
{
PushButtonState pbState = DetermineState(up);
// First handle transparent case
if (ButtonRenderer.IsBackgroundPartiallyTransparent(pbState))
{
ButtonRenderer.DrawParentBackground(e.Graphics, bounds, Control);
}
// Now draw the actual themed background
if (!DpiHelper.IsScalingRequirementMet)
{
ButtonRenderer.DrawButton(e.Graphics, Control.ClientRectangle, false, pbState);
}
else
{
ButtonRenderer.DrawButtonForHandle(e.Graphics, Control.ClientRectangle, false, pbState, Control.HandleInternal);
}
// Now overlay the background image or backcolor (the former overrides the latter), leaving a
// margin. We hardcode this margin for now since GetThemeMargins returns 0 all the
// time.
// Changing this because GetThemeMargins simply does not
// work in some cases.
bounds.Inflate(-buttonBorderSize, -buttonBorderSize);
//only paint if the user said not to use the themed backcolor.
if (!Control.UseVisualStyleBackColor)
{
bool painted = false;
bool isHighContrastHighlighted = up && IsHighContrastHighlighted();
Color color = isHighContrastHighlighted ? SystemColors.Highlight : Control.BackColor;
// Note: PaintEvent.HDC == 0 if GDI+ has used the HDC -- it wouldn't be safe for us
// to use it without enough bookkeeping to negate any performance gain of using GDI.
if (color.A == 255 && !e.HDC.IsNull)
{
if (DisplayInformation.BitsPerPixel > 8)
{
var r = new RECT(bounds.X, bounds.Y, bounds.Right, bounds.Bottom);
// SysColorBrush does not have to be deleted.
User32.FillRect(
e,
ref r,
isHighContrastHighlighted ? User32.GetSysColorBrush(ColorTranslator.ToOle(color) & 0xFF) : Control.BackColorBrush);
painted = true;
}
}
if (!painted)
{
// don't paint anything from 100% transparent background
//
if (color.A > 0)
{
if (color.A == 255)
{
color = e.Graphics.GetNearestColor(color);
}
// Color has some transparency or we have no HDC, so we must
// fall back to using GDI+.
//
using (Brush brush = new SolidBrush(color))
{
e.Graphics.FillRectangle(brush, bounds);
}
}
}
}
//This code is mostly taken from the non-themed rendering code path.
if (Control.BackgroundImage != null && !DisplayInformation.HighContrast)
{
ControlPaint.DrawBackgroundImage(e.Graphics, Control.BackgroundImage, Color.Transparent, Control.BackgroundImageLayout, Control.ClientRectangle, bounds, Control.DisplayRectangle.Location, Control.RightToLeft);
}
}
