private void invalidate(IRenderContext context, IRenderer renderer)
{
/*this should only ever fail once when a font has been changed
* because a font MUST be allocated on the main rendering thread.*/
IFont font = context.AllocateFont(p_Font);
Size = renderer.MeasureString(p_Text, font);
//update text information
p_Lines = p_Text.Split('\n');
p_Invalidate = false;
}
private void invalidate(IRenderContext context, IRenderer renderer)
{
//font null?
if (p_Font == null)
{
return;
}
//allocate the current font onto
//the rendering context
IFont font = null;
try { font = context.AllocateFont(p_Font); }
catch { return; }
//keep reducing the text until it all fits in the text box
int maxWidth = Width - (p_TextXOffset * 2);
while (renderer.MeasureString(p_Text, font).Width >= maxWidth)
{
p_Text = p_Text.Substring(0, p_Text.Length - 1);
}
//set the height to the height of the font + padding
p_CaratHeight = renderer.GetFontHeight(font);
Height = p_CaratHeight + (p_Padding << 1);
//calculate the render x position of the Carat
int renderX = p_TextXOffset;
int textLength = p_Text.Length;
if (p_CaratPosition >= textLength)
{
p_CaratPosition = textLength - 1;
}
for (int c = 0; c < p_CaratPosition + 1; c++)
{
char character = p_Text[c];
int width = renderer.GetCharWidth(character, font);
renderX += width;
}
p_CaratRenderX = renderX;
p_Invalidate = false;
}