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Bug 911409 - Properly handle rendering menu arrows on high-dpi displays on Windows. r=tabraldes

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This commit is contained in:
Jim Mathies 2014-05-05 13:32:54 -05:00
parent e4c098d675
commit e5149d6a1e
1 changed files with 44 additions and 7 deletions
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51
widget/windows/nsNativeThemeWin.cpp
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@ -1775,9 +1775,43 @@ RENDER_AGAIN:
DrawThemeBackground(theme, hdc, MENU_POPUPSEPARATOR, /* state */ 0, &sepRect, &clipRect);
}
else if (aWidgetType == NS_THEME_MENUARROW)
{
// We're dpi aware and as such on systems that have dpi > 96 set, the
// theme library expects us to do proper positioning and scaling of glyphs.
// For NS_THEME_MENUARROW, layout may hand us a widget rect larger than the
// glyph rect we request in GetMinimumWidgetSize. To prevent distortion we
// have to position and scale what we draw.
SIZE glyphSize;
GetThemePartSize(theme, hdc, part, state, nullptr, TS_TRUE, &glyphSize);
int32_t widgetHeight = widgetRect.bottom - widgetRect.top;
RECT renderRect = widgetRect;
// We request (glyph width * 2, glyph height) in GetMinimumWidgetSize. In
// Firefox some menu items provide the full height of the item to us, in
// others our widget rect is the exact dims of our arrow glyph. Adjust the
// vertical position by the added space, if any exists.
renderRect.top += ((widgetHeight - glyphSize.cy) / 2);
renderRect.bottom = renderRect.top + glyphSize.cy;
// I'm using the width of the arrow glyph for the arrow-side padding.
// AFAICT there doesn't appear to be a theme constant we can query
// for this value. Generally this looks correct, and has the added
// benefit of being a dpi adjusted value.
if (!IsFrameRTL(aFrame)) {
renderRect.right = widgetRect.right - glyphSize.cx;
renderRect.left = renderRect.right - glyphSize.cx;
} else {
renderRect.left = glyphSize.cx;
renderRect.right = renderRect.left + glyphSize.cx;
}
DrawThemeBGRTLAware(theme, hdc, part, state, &renderRect, &clipRect,
IsFrameRTL(aFrame));
}
// The following widgets need to be RTL-aware
else if (aWidgetType == NS_THEME_MENUARROW ||
aWidgetType == NS_THEME_RESIZER ||
else if (aWidgetType == NS_THEME_RESIZER ||
aWidgetType == NS_THEME_DROPDOWN_BUTTON)
{
DrawThemeBGRTLAware(theme, hdc, part, state,
@ -2239,11 +2273,6 @@ nsNativeThemeWin::GetMinimumWidgetSize(nsRenderingContext* aContext, nsIFrame* a
case NS_THEME_MENUITEMTEXT:
return NS_OK;
case NS_THEME_MENUARROW:
aResult->width = 26;
aResult->height = 16;
return NS_OK;
case NS_THEME_PROGRESSBAR:
case NS_THEME_PROGRESSBAR_VERTICAL:
// Best-fit size for progress meters is too large for most
@ -2403,6 +2432,14 @@ nsNativeThemeWin::GetMinimumWidgetSize(nsRenderingContext* aContext, nsIFrame* a
aResult->width += gutterSize.cx;
break;
}
case NS_THEME_MENUARROW:
{
// Use the width of the arrow glyph as padding. See the drawing
// code for details.
aResult->width *= 2;
break;
}
}
::ReleaseDC(nullptr, hdc);