/// <summary>
/// Perform the layout of the html in the control.
/// </summary>
protected override void OnLayout(LayoutEventArgs levent)
{
if (_htmlContainer != null)
{
Graphics g = Utils.CreateGraphics(this);
if (g != null)
{
using (g)
using (var ig = new GraphicsAdapter(g, _htmlContainer.UseGdiPlusTextRendering))
{
var newSize = HtmlRendererUtils.Layout(ig,
_htmlContainer.HtmlContainerInt,
new RSize(ClientSize.Width - Padding.Horizontal, ClientSize.Height - Padding.Vertical),
new RSize(MinimumSize.Width - Padding.Horizontal, MinimumSize.Height - Padding.Vertical),
new RSize(MaximumSize.Width - Padding.Horizontal, MaximumSize.Height - Padding.Vertical),
AutoSize,
AutoSizeHeightOnly);
ClientSize = Utils.ConvertRound(new RSize(newSize.Width + Padding.Horizontal, newSize.Height + Padding.Vertical));
}
}
}
base.OnLayout(levent);
}
/// <summary>
/// Measure the size of the html by performing layout under the given restrictions.
/// </summary>
/// <param name="htmlContainer">the html to calculate the layout for</param>
/// <param name="minSize">the minimal size of the rendered html (zero - not limit the width/height)</param>
/// <param name="maxSize">the maximum size of the rendered html, if not zero and html cannot be layout within the limit it will be clipped (zero - not limit the width/height)</param>
/// <returns>return: the size of the html to be rendered within the min/max limits</returns>
private static Size MeasureHtmlByRestrictions(HtmlContainer htmlContainer, Size minSize, Size maxSize)
{
// use desktop created graphics to measure the HTML
using (var g = Graphics.FromHwnd(IntPtr.Zero))
using (var mg = new GraphicsAdapter(g, htmlContainer.UseGdiPlusTextRendering))
{
var sizeInt = HtmlRendererUtils.MeasureHtmlByRestrictions(mg, htmlContainer.HtmlContainerInt, Utils.Convert(minSize), Utils.Convert(maxSize));
if (maxSize.Width < 1 && sizeInt.Width > 4096)
sizeInt.Width = 4096;
return Utils.ConvertRound(sizeInt);
}
}
/// <summary>
/// Render the html using the given device.
/// </summary>
/// <param name="g">the device to use to render</param>
public void PerformPaint(Graphics g)
{
ArgChecker.AssertArgNotNull(g, "g");
using (var ig = new GraphicsAdapter(g, _useGdiPlusTextRendering))
{
_htmlContainerInt.PerformPaint(ig);
}
}
public override void MeasureString(string str, RFont font, double maxWidth, out int charFit, out double charFitWidth)
{
using (var g = new GraphicsAdapter(_control.CreateGraphics(), _useGdiPlusTextRendering, true))
{
g.MeasureString(str, font, maxWidth, out charFit, out charFitWidth);
}
}