/// <summary>
/// Calculate or render the contents of our RichTextBox for printing
/// </summary>
/// <param name="measureOnly">If true, only the calculation is performed,
/// otherwise the text is rendered as well</param>
/// <param name="b"></param>
/// <param name="rtb"></param>
/// <param name="charFrom">Index of first character to be printed</param>
/// <param name="charTo">Index of last character to be printed</param>
/// <returns>(Index of last character that fitted on the
/// page) + 1</returns>
//public int FormatRange(bool measureOnly, PrintPageEventArgs e, int charFrom, int charTo)
public int FormatRange(bool measureOnly, DevAge.Windows.Forms.DevAgeRichTextBox rtb,
ref Bitmap b, int charFrom, int charTo)
{
// Specify which characters to print
STRUCT_CHARRANGE cr;
cr.cpMin = charFrom;
cr.cpMax = charTo;
// Specify the area inside page margins
STRUCT_RECT rc;
rc.Top = HundredthInchToTwips(0);
rc.Bottom = HundredthInchToTwips(b.Height);
rc.Left = HundredthInchToTwips(0);
rc.Right = HundredthInchToTwips(b.Width);
// Specify the page area
STRUCT_RECT rcPage;
rcPage.Top = HundredthInchToTwips(0);
rcPage.Bottom = HundredthInchToTwips(b.Height);
rcPage.Left = HundredthInchToTwips(0);
rcPage.Right = HundredthInchToTwips(b.Width);
// Get device context of output device
Graphics g = Graphics.FromImage(b);
IntPtr hdc = g.GetHdc();
// Fill in the FORMATRANGE struct
STRUCT_FORMATRANGE fr;
fr.chrg = cr;
fr.hdc = hdc;
fr.hdcTarget = hdc;
fr.rc = rc;
fr.rcPage = rcPage;
// Non-Zero wParam means render, Zero means measure
Int32 wParam = (measureOnly ? 0 : 1);
// Allocate memory for the FORMATRANGE struct and
// copy the contents of our struct to this memory
IntPtr lParam = Marshal.AllocCoTaskMem(Marshal.SizeOf(fr));
Marshal.StructureToPtr(fr, lParam, false);
// Send the actual Win32 message
int res = SendMessage(rtb.Handle, EM_FORMATRANGE, wParam, lParam);
// Free allocated memory
Marshal.FreeCoTaskMem(lParam);
// and release the device context
g.ReleaseHdc(hdc);
g.Dispose();
return(res);
}
/// <summary>
/// Create the editor control
/// </summary>
/// <returns></returns>
protected override Control CreateControl()
{
DevAge.Windows.Forms.DevAgeRichTextBox editor = new DevAge.Windows.Forms.DevAgeRichTextBox();
editor.BorderStyle = BorderStyle.None;
editor.AutoSize = false;
editor.Validator = this;
return(editor);
}
/// <summary>
/// Create the editor control
/// </summary>
/// <returns></returns>
protected override Control CreateControl()
{
DevAge.Windows.Forms.DevAgeRichTextBox editor = new DevAge.Windows.Forms.DevAgeRichTextBox();
editor.BorderStyle = BorderStyle.None;
editor.AutoSize = false;
editor.Validator = this;
return editor;
}
/// <summary>
/// This method is called just before the edit start.
/// You can use this method to customize the editor with the cell informations.
/// </summary>
/// <param name="cellContext"></param>
/// <param name="editorControl"></param>
protected override void OnStartingEdit(CellContext cellContext, Control editorControl)
{
base.OnStartingEdit(cellContext, editorControl);
DevAge.Windows.Forms.DevAgeRichTextBox l_RchTxtBox = (DevAge.Windows.Forms.DevAgeRichTextBox)editorControl;
l_RchTxtBox.WordWrap = cellContext.Cell.View.WordWrap;
// to set the scroll of the textbox to the initial position
//(otherwise the richtextbox uses the previous scroll position)
l_RchTxtBox.SelectionStart = 0;
l_RchTxtBox.SelectionLength = 0;
}
/// <summary>
/// If ValueEventArgs is a font, use it to change SelectionFont
/// If String, assign it as rtf
/// If Int32, assign it as offset
/// If HorizontalAlignment, assign as SelectionAlignment
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public override void OnValueChanging(CellContext sender, ValueChangeEventArgs e)
{
base.OnValueChanging(sender, e);
// only check if event args is of known type if event is not of type rich text
if (!(e.NewValue is DevAge.Windows.Forms.RichText))
{
Editors.RichTextBox richEditor = (Editors.RichTextBox)sender.Cell.Editor;
DevAge.Windows.Forms.DevAgeRichTextBox richTextBox = richEditor.Control;
// if editor is not open, assign value and select all text
if (sender.Cell.Editor.EditCell == null)
{
richTextBox.Value = sender.Value as DevAge.Windows.Forms.RichText;
richTextBox.SelectAll();
}
if (e.NewValue is Font)
{
richTextBox.SelectionFont = (Font)e.NewValue;
}
else if (e.NewValue is Color)
{
richTextBox.SelectionColor = (Color)e.NewValue;
}
else if (e.NewValue is Int32)
{
richTextBox.SelectionCharOffset = (int)e.NewValue;
}
else if (e.NewValue is HorizontalAlignment)
{
richTextBox.SelectionAlignment = (HorizontalAlignment)e.NewValue;
}
else if (e.NewValue is DevAge.Windows.Forms.EffectType)
{
richTextBox.SelectionEffect = (DevAge.Windows.Forms.EffectType)e.NewValue;
}
// if editor is not open, use changed value for cell
if (sender.Cell.Editor.EditCell == null)
{
sender.Value = richTextBox.Value;
}
}
}
/// <summary>
/// This method is called just before the edit start.
/// You can use this method to customize the editor with the cell informations.
/// </summary>
/// <param name="cellContext"></param>
/// <param name="editorControl"></param>
protected override void OnStartingEdit(CellContext cellContext, Control editorControl)
{
base.OnStartingEdit(cellContext, editorControl);
DevAge.Windows.Forms.DevAgeRichTextBox l_RchTxtBox = editorControl as DevAge.Windows.Forms.DevAgeRichTextBox;
//[email protected]: check if control exists
if (l_RchTxtBox == null)
{
return;
}
l_RchTxtBox.WordWrap = cellContext.Cell.View.WordWrap;
// to set the scroll of the textbox to the initial position
//(otherwise the richtextbox uses the previous scroll position)
l_RchTxtBox.SelectionStart = 0;
l_RchTxtBox.SelectionLength = 0;
}
/// <summary>
/// Free cached data from rich edit control after printing
/// </summary>
public void FormatRangeDone(DevAge.Windows.Forms.DevAgeRichTextBox RTB)
{
IntPtr lParam = new IntPtr(0);
SendMessage(RTB.Handle, EM_FORMATRANGE, 0, lParam);
}
