/// <summary>
/// Perform the layout of the html in the control.
/// </summary>
protected override Size MeasureOverride(Size constraint)
{
if (_htmlContainer != null)
{
using (var ig = new GraphicsAdapter())
{
var horizontal = Padding.Left + Padding.Right + BorderThickness.Left + BorderThickness.Right;
var vertical = Padding.Top + Padding.Bottom + BorderThickness.Top + BorderThickness.Bottom;
var size = new RSize(constraint.Width < Double.PositiveInfinity ? constraint.Width - horizontal : 0, constraint.Height < Double.PositiveInfinity ? constraint.Height - vertical : 0);
var minSize = new RSize(MinWidth < Double.PositiveInfinity ? MinWidth - horizontal : 0, MinHeight < Double.PositiveInfinity ? MinHeight - vertical : 0);
var maxSize = new RSize(MaxWidth < Double.PositiveInfinity ? MaxWidth - horizontal : 0, MaxHeight < Double.PositiveInfinity ? MaxHeight - vertical : 0);
var newSize = HtmlRendererUtils.Layout(ig, _htmlContainer.HtmlContainerInt, size, minSize, maxSize, AutoSize, AutoSizeHeightOnly);
constraint = new Size(newSize.Width + horizontal, newSize.Height + vertical);
}
}
if (double.IsPositiveInfinity(constraint.Width) || double.IsPositiveInfinity(constraint.Height))
{
constraint = Size.Empty;
}
return(constraint);
}
/// <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));
return(Utils.ConvertRound(sizeInt));
}
}
/// <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 mg = new GraphicsAdapter())
{
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>
/// Perform the layout of the html in the control.
/// </summary>
protected override void OnLayout(LayoutEventArgs levent)
{
if (_htmlContainer != null)
{
using (Graphics g = CreateGraphics())
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);
}
private Size?GetPreferredSize()
{
if (_htmlContainer != null)
{
using (Graphics g = CreateGraphics()) {
using (var ig = new GraphicsAdapter(g, _htmlContainer.UseGdiPlusTextRendering)) {
var newSize = HtmlRendererUtils.Layout(ig,
_htmlContainer.HtmlContainerInt,
new RSize(ClientSize.Width - InternalPadding.Horizontal - Padding.Horizontal, ClientSize.Height - InternalPadding.Vertical - Padding.Vertical),
new RSize(MinimumSize.Width - InternalPadding.Horizontal - Padding.Horizontal, MinimumSize.Height - InternalPadding.Vertical - Padding.Vertical),
new RSize(MaximumSize.Width - InternalPadding.Horizontal - Padding.Horizontal, MaximumSize.Height - InternalPadding.Vertical - Padding.Vertical),
AutoSize,
AutoSizeHeightOnly);
return(Utils.ConvertRound(new RSize(newSize.Width + InternalPadding.Horizontal + Padding.Horizontal, newSize.Height + InternalPadding.Vertical - Padding.Vertical)));
}
}
}
return(null);
}
/// <summary>
/// Perform the layout of the html in the control.
/// </summary>
protected void PerformLayout()
{
if (_htmlContainer != null)
{
using (var g = Utils.CreateGraphics())
{
using (var ig = new GraphicsAdapter(g))
{
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),
true,
false);
ClientSize = Utils.ConvertRound(new RSize(newSize.Width + Padding.Horizontal, newSize.Height + Padding.Vertical));
}
}
}
}