internal override Size GetPreferredSizeCore(Size proposedConstraints)
{
Size textExtent;
Size bordersAndPadding = this.GetBordersAndPadding();
proposedConstraints -= bordersAndPadding;
proposedConstraints = LayoutUtils.UnionSizes(proposedConstraints, Size.Empty);
if (string.IsNullOrEmpty(this.Text))
{
using (WindowsFont font = WindowsFont.FromFont(this.Font))
{
textExtent = WindowsGraphicsCacheManager.MeasurementGraphics.GetTextExtent("0", font);
textExtent.Width = 0;
goto Label_0113;
}
}
if (this.UseGDIMeasuring())
{
TextFormatFlags flags = (this.FlatStyle == System.Windows.Forms.FlatStyle.System) ? TextFormatFlags.Default : this.CreateTextFormatFlags(proposedConstraints);
textExtent = this.MeasureTextCache.GetTextSize(this.Text, this.Font, proposedConstraints, flags);
}
else
{
using (Graphics graphics = WindowsFormsUtils.CreateMeasurementGraphics())
{
using (StringFormat format = this.CreateStringFormat())
{
SizeF layoutArea = (proposedConstraints.Width == 1) ? new SizeF(0f, (float)proposedConstraints.Height) : new SizeF((float)proposedConstraints.Width, (float)proposedConstraints.Height);
textExtent = Size.Ceiling(graphics.MeasureString(this.Text, this.Font, layoutArea, format));
}
}
}
Label_0113:
return(textExtent + bordersAndPadding);
}
public void Font_GetCharSet(string family, float size, byte charset)
{
using Font font = new Font(family, size);
if (font.Name != family)
{
// Not installed on this machine
return;
}
using WindowsFont windowsFont = WindowsFont.FromFont(font, Gdi32.QUALITY.CLEARTYPE);
Assert.Equal(charset, windowsFont.CharSet);
}
public void Font_GetOverhangPadding(string family, float size, float expected)
{
using Font font = new Font(family, size);
if (font.Name != family)
{
// Not installed on this machine
return;
}
using WindowsFont windowsFont = WindowsFont.FromFont(font, Gdi32.QUALITY.CLEARTYPE);
WindowsGraphics graphics = WindowsGraphicsCacheManager.MeasurementGraphics;
Assert.Equal(expected, graphics.GetOverhangPadding(windowsFont));
}
public void Font_MeasureText(string family, float size, Size proposedSize, uint dt, Size expected)
{
using Font font = new Font(family, size);
if (font.Name != family)
{
// Not installed on this machine
return;
}
using WindowsFont windowsFont = WindowsFont.FromFont(font, Gdi32.QUALITY.CLEARTYPE);
WindowsGraphics graphics = WindowsGraphicsCacheManager.MeasurementGraphics;
Size measure = graphics.MeasureText("Windows Foundation Classes", windowsFont, proposedSize, (User32.DT)dt);
Assert.Equal(expected, measure);
}
public void Font_GetTextMargins(string family, float size, int left, int right)
{
using Font font = new Font(family, size);
if (font.Name != family)
{
// Not installed on this machine
return;
}
using WindowsFont windowsFont = WindowsFont.FromFont(font, Gdi32.QUALITY.CLEARTYPE);
WindowsGraphics graphics = WindowsGraphicsCacheManager.MeasurementGraphics;
User32.DRAWTEXTPARAMS margins = graphics.GetTextMargins(windowsFont);
Assert.Equal(left, margins.iLeftMargin);
Assert.Equal(right, margins.iRightMargin);
}
public void Font_GetTextExtent(string family, float size, int width, int height)
{
using Font font = new Font(family, size);
if (font.Name != family)
{
// Not installed on this machine
return;
}
using WindowsFont windowsFont = WindowsFont.FromFont(font, Gdi32.QUALITY.CLEARTYPE);
WindowsGraphics graphics = WindowsGraphicsCacheManager.MeasurementGraphics;
Size extent = graphics.GetTextExtent("Whizzo Butter", windowsFont);
Assert.Equal(width, extent.Width);
Assert.Equal(height, extent.Height);
}
public void Font_AdjustForVerticalAlignment(string family, float size, Rectangle bounds, uint dt, Rectangle expected)
{
using Font font = new Font(family, size);
if (font.Name != family)
{
// Not installed on this machine
return;
}
using WindowsFont windowsFont = WindowsFont.FromFont(font, Gdi32.QUALITY.CLEARTYPE);
WindowsGraphics graphics = WindowsGraphicsCacheManager.MeasurementGraphics;
graphics.DeviceContext.SelectFont(windowsFont);
User32.DRAWTEXTPARAMS param = default;
Rectangle result = WindowsGraphics.AdjustForVerticalAlignment(
graphics,
"Windows Foundation Classes",
bounds,
(User32.DT)dt,
ref param);
Assert.Equal(expected, result);
}
public static WindowsFont GetWindowsFont(Font font, WindowsFontQuality fontQuality)
{
if (font == null)
{
return(null);
}
// First check if font is in the cache.
int count = 0;
int index = currentIndex;
// Search by index of most recently added object.
while (count < WindowsFontCache.Count)
{
if (WindowsFontCache[index].Key.Equals(font)) // don't do shallow comparison, we could miss cloned fonts.
{
// We got a Font in the cache, let's see if we have a WindowsFont with the same quality as required by the caller.
// WARNING: It is not expected that the WindowsFont is disposed externally since it is created by this class.
Debug.Assert(WindowsFontCache[index].Value.Hfont != IntPtr.Zero, "Cached WindowsFont was disposed, enable GDI_FINALIZATION_WATCH to track who did it!");
WindowsFont wf = WindowsFontCache[index].Value;
if (wf.Quality == fontQuality)
{
return(wf);
}
}
index--;
count++;
if (index < 0)
{
index = CacheSize - 1;
}
}
// Font is not in the cache, let's add it.
WindowsFont winFont = WindowsFont.FromFont(font, fontQuality);
KeyValuePair <Font, WindowsFont> newEntry = new KeyValuePair <Font, WindowsFont>(font, winFont);
currentIndex++;
if (currentIndex == CacheSize)
{
currentIndex = 0;
}
if (WindowsFontCache.Count == CacheSize) // No more room, update current index.
{
WindowsFont wfont = null;
// Go through the existing fonts in the cache, and see if any
// are not in use by a DC. If one isn't, replace that. If
// all are in use, new up a new font and do not cache it.
bool finished = false;
int startIndex = currentIndex;
int loopIndex = startIndex + 1;
while (!finished)
{
if (loopIndex >= CacheSize)
{
loopIndex = 0;
}
if (loopIndex == startIndex)
{
finished = true;
}
wfont = WindowsFontCache[loopIndex].Value;
if (!DeviceContexts.IsFontInUse(wfont))
{
currentIndex = loopIndex;
finished = true;
break;
}
else
{
loopIndex++;
wfont = null;
}
}
if (wfont != null)
{
WindowsFontCache[currentIndex] = newEntry;
winFont.OwnedByCacheManager = true;
#if GDI_FONT_CACHE_TRACK
Debug.WriteLine("Removing from cache: " + wfont);
Debug.WriteLine("Adding to cache: " + winFont);
#endif
wfont.OwnedByCacheManager = false;
wfont.Dispose();
}
else
{
// do not cache font - caller is ALWAYS responsible for
// disposing now. If it is owned by the CM, it will not
// disposed.
winFont.OwnedByCacheManager = false;
#if GDI_FONT_CACHE_TRACK
Debug.WriteLine("Creating uncached font: " + winFont);
#endif
}
}
else
{
winFont.OwnedByCacheManager = true;
WindowsFontCache.Add(newEntry);
#if GDI_FONT_CACHE_TRACK
Debug.WriteLine("Adding to cache: " + winFont);
#endif
}
return(winFont);
}
