// Convenience method for checking if the specified element has a design time lock.
private bool IsElementLocked(NativeMethods.IHTMLElement element)
{
object[] attribute = new object[1];
element.GetAttribute(DesignTimeLockAttribute, 0, attribute);
if (attribute[0] == null)
{
NativeMethods.IHTMLStyle style = element.GetStyle();
attribute[0] = style.GetAttribute(DesignTimeLockAttribute, 0);
}
return((attribute[0] != null) && (attribute[0] is string));
}
/// <include file='doc\TemplateEditingFrame.uex' path='docs/doc[@for="TemplateEditingFrame.Resize"]/*' />
/// <devdoc>
/// <para>
/// Resizes the
/// template editing frame.
/// </para>
/// </devdoc>
public void Resize(int width, int height)
{
if (htmlElemContent != null)
{
NativeMethods.IHTMLStyle htmlStyle = htmlElemContent.GetStyle();
if (htmlStyle != null)
{
htmlStyle.SetPixelWidth(width);
htmlStyle.SetPixelHeight(height);
}
}
}
/// <include file='doc\UserControlDesigner.uex' path='docs/doc[@for="ControlDesigner.RemoveSizeAttributes"]/*' />
/// <devdoc>
/// <para>
/// Maps the width, height, left and top style attributes to the respective properties
/// on the web control.
/// </para>
/// </devdoc>
private void RemoveSizeAttributes()
{
Debug.Assert(IsWebControl, "RemoveSizeAttributes should only be called for WebControls");
NativeMethods.IHTMLElement htmlElement = (NativeMethods.IHTMLElement)DesignTimeElement;
if (htmlElement == null)
{
return;
}
NativeMethods.IHTMLStyle htmlStyle = htmlElement.GetStyle();
if (htmlStyle == null)
{
return;
}
try {
string cssText = htmlStyle.GetCssText();
if (cssText == null || cssText.Equals(String.Empty))
{
return;
}
WebControl control = (WebControl)Component;
// Obtain the left, top and position style attributes from Trident.
int width = htmlStyle.GetPixelWidth();
int height = htmlStyle.GetPixelHeight();
if (width > 0)
{
control.Width = width;
htmlElement.SetAttribute("Width", width, 0);
}
if (height > 0)
{
control.Height = height;
htmlElement.SetAttribute("Height", height, 0);
}
}
catch (Exception ex) {
Debug.Fail(ex.ToString());
}
// Remove the width and height style attributes.
htmlStyle.RemoveAttribute("width", /*lFlags*/ 0);
htmlStyle.RemoveAttribute("height", /*lFlags*/ 0);
}
/// <devdoc>
/// <para>
/// Toggles the visibility of the frame either by placing it in the view-linked markup
/// or by removing it from the live tree.
/// </para>
/// </devdoc>
private void ShowInternal(bool fShow)
{
// Return immediately either if no frame HTML element exists or if the visibility
// of the frame is the same as that of the requested state.
if (htmlElemFrame == null || (this.fVisible == fShow))
{
return;
}
// To show the frame, place it within the root view-linked element.
// To hide the frame, remove it completely from the view-linked tree.
try {
NativeMethods.IHTMLDOMNode domNodeFrame = (NativeMethods.IHTMLDOMNode)htmlElemFrame;
NativeMethods.IHTMLElement frameElement = (NativeMethods.IHTMLElement)domNodeFrame;
NativeMethods.IHTMLStyle frameStyle = frameElement.GetStyle();
if (fShow)
{
frameStyle.SetDisplay(String.Empty);
}
else
{
// Clear the template contents when hiding the frame. This will ensure that
// any controls within that template are removed from the designer host, etc.
if (templateElements != null)
{
for (int i = 0; i < templateElements.Length; i++)
{
if (templateElements[i] != null)
{
NativeMethods.IHTMLElement htmlElemTemplate = (NativeMethods.IHTMLElement)templateElements[i];
htmlElemTemplate.SetInnerHTML(String.Empty);
}
}
}
frameStyle.SetDisplay("none");
}
}
catch (Exception ex) {
Debug.Fail(ex.ToString());
}
this.fVisible = fShow;
}
/// <summary>Toggle the design time lock state of the selected items.</summary>
public void ToggleLock()
{
//Switch the lock on each item
foreach (NativeMethods.IHTMLElement element in this.items)
{
NativeMethods.IHTMLStyle style = element.GetStyle();
if (IsElementLocked(element))
{
// We need to remove attributes off the element and the style because of a bug in Trident
element.RemoveAttribute(DesignTimeLockAttribute, 0);
style.RemoveAttribute(DesignTimeLockAttribute, 0);
}
else
{
//We need to add attributes to the element and the style because of a bug in Trident
element.SetAttribute(DesignTimeLockAttribute, "true", 0);
style.SetAttribute(DesignTimeLockAttribute, "true", 0);
}
}
}