private RichText(string s, RichTextParameters parameters, IList parts)
{
myParameters = parameters;
myString = s;
myParts = new ArrayList(parts.Count);
for (int i = 0; i < parts.Count; i++)
{
myParts.Add(((RichString)parts[i]).Clone());
}
}
/// <summary>
/// Creates a new rich text block
/// </summary>
/// <param name="s">Text content</param>
/// <param name="parameters">Parameters to use</param>
public RichText(string s, RichTextParameters parameters)
{
myParameters = parameters;
if (s != null && s.Length > 0)
{
myString = s;
myParts.Add(new RichString(0, s.Length, parameters.Style, this));
}
}
/// <summary>
/// Draws the formatted string on a given graphics
/// </summary>
/// <param name="hdc">The device context to draw the string in.</param>
/// <param name="parameters">Text formatting parameters</param>
/// <exception cref="ArgumentNullException"><i>g</i> is null</exception>
/// <exception cref="ArgumentNullException"><i>font</i> is null</exception>
public int Draw(IntPtr hdc, Rectangle rect, RichTextParameters parameters)
{
Font hFont = GetParametrizedFont(parameters);
RECT rc = new RECT();
rc.left = rect.Left;
rc.top = rect.Top;
rc.bottom = rect.Bottom;
RectangleF bounds;
IntPtr oldFont = Win32Declarations.SelectObject(hdc, ourFontCache.GetHFont(hFont));
int oldColor = Win32Declarations.SetTextColor(hdc, Win32Declarations.ColorToRGB(myStyle.ForegroundColor));
int oldBkColor = Win32Declarations.SetBkColor(hdc, Win32Declarations.ColorToRGB(myStyle.BackgroundColor));
BackgroundMode oldBkMode = Win32Declarations.SetBkMode(hdc, myStyle.BackgroundColor == Color.Transparent ? BackgroundMode.TRANSPARENT : BackgroundMode.OPAQUE);
Win32Declarations.DrawText(hdc, PartText, PartText.Length, ref rc, DrawTextFormatFlags.DT_CALCRECT | DrawTextFormatFlags.DT_SINGLELINE | DrawTextFormatFlags.DT_NOPREFIX | DrawTextFormatFlags.DT_VCENTER | DrawTextFormatFlags.DT_NOCLIP);
if (rc.bottom > rect.Bottom)
{
rc.bottom = rect.Bottom;
}
if (rc.right > rect.Right)
{
rc.right = rect.Right;
}
bounds = new RectangleF(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top);
Win32Declarations.DrawText(hdc, PartText, PartText.Length, ref rc, DrawTextFormatFlags.DT_SINGLELINE | DrawTextFormatFlags.DT_NOPREFIX | DrawTextFormatFlags.DT_VCENTER | DrawTextFormatFlags.DT_NOCLIP);
Win32Declarations.SetBkMode(hdc, oldBkMode);
Win32Declarations.SetBkColor(hdc, oldBkColor);
Win32Declarations.SetTextColor(hdc, oldColor);
Win32Declarations.SelectObject(hdc, oldFont);
switch (myStyle.Effect)
{
case TextStyle.EffectStyle.StrikeOut:
StrikeOut(hdc, bounds);
break;
case TextStyle.EffectStyle.StraightUnderline:
UnderlineStraight(hdc, bounds);
break;
case TextStyle.EffectStyle.WeavyUnderline:
UnderlineWeavy(hdc, bounds);
break;
}
return(rc.right - rc.left);
}
/// <summary>
/// Gets size of the string in the given graphics
/// </summary>
/// <param name="hdc">The device context to calculate size in</param>
/// <param name="parameters">Formatting parameters to use</param>
/// <returns>Size of the string when drawn in a given graphics</returns>
/// <exception cref="ArgumentNullException"><i>g</i> is null.</exception>
public SizeF GetSize(IntPtr hdc, RichTextParameters parameters)
{
Font hFont = GetParametrizedFont(parameters);
RECT rc = new RECT();
rc.left = 0;
rc.top = 0;
IntPtr oldFont = Win32Declarations.SelectObject(hdc, ourFontCache.GetHFont(hFont));
Win32Declarations.DrawText(hdc, PartText, PartText.Length, ref rc, DrawTextFormatFlags.DT_CALCRECT | DrawTextFormatFlags.DT_SINGLELINE | DrawTextFormatFlags.DT_NOPREFIX);
Win32Declarations.SelectObject(hdc, oldFont);
return(new SizeF(rc.right - rc.left, rc.bottom - rc.top));
}
public int GetSymbolByOffset(int x, RichTextParameters parameters, IntPtr hdc)
{
if (x < 0)
{
return(-1);
}
Font hFont = GetParametrizedFont(parameters);
RECT rc = new RECT();
rc.left = 0;
rc.top = 0;
int currentX = 0;
IntPtr oldFont = Win32Declarations.SelectObject(hdc, ourFontCache.GetHFont(hFont));
try
{
for (int i = 0; i < PartText.Length; i++)
{
Win32Declarations.DrawText(hdc, PartText.Substring(i, 1), 1, ref rc, DrawTextFormatFlags.DT_CALCRECT | DrawTextFormatFlags.DT_SINGLELINE | DrawTextFormatFlags.DT_NOPREFIX | DrawTextFormatFlags.DT_NOCLIP);
currentX += rc.right - rc.left;
if (currentX > x)
{
return(i);
}
}
return(-1);
}
finally
{
Win32Declarations.SelectObject(hdc, oldFont);
}
}
/// <summary>
/// Returns parametrized font
/// </summary>
/// <param name="parameters">Formatting parameters to use</param>
private Font GetParametrizedFont(RichTextParameters parameters)
{
return(ourFontCache.GetFont(parameters.Font, myStyle.FontStyle));
}
