/// <summary>
/// calc layout and render
/// </summary>
/// <param name="dev"></param>
public void UpdateArea(IDeviceContext dev)
//public void UpdateArea(Graphics g)
{
free_lines();
if (TextRegion != null)
{
TextRegion.Dispose();
}
TextRegion = new Region();
IntPtr hdc = dev.GetHdc();
//IntPtr hdc = g.GetHdc();
IntPtr font_ptr = Font.ToHfont();
//IntPtr font_ptr = font_ptr_cached;
IntPtr old_font = NativeGdi.SelectObject(hdc, font_ptr);
//Font hdc_font = Font.FromHfont(old_font);
uint old_align = NativeGdi.SetTextAlign(hdc, 0);
int line_height = (int)Math.Ceiling(Font.GetHeight());
IntPtr char_buffer = IntPtr.Zero;
int select_first = 0;
int select_last = 0;
int select_line_first = 0;
int select_line_last = 0;
OnFetchSelectionRange(out select_first, out select_last);
bool EOF = false;
int chars_filled = 0;
int current_char_offset = 0;
int current_Y = 0;
while (current_Y + line_height < Bounds.Height)
{
select_line_first = 0;
select_line_last = 0;
OnFetchCharsToScreen
(current_char_offset,
true,
out char_buffer,
out chars_filled,
out EOF);
LineInfoSS new_line = new LineInfoSS();
new_line.ReferensePoint = new Point(Bounds.X, Bounds.Y + current_Y);
new_line.CharFirst = current_char_offset;
//если буфер не пуст рисуем строку
if (chars_filled != 0)
{
new_line.PrepareLayout
(hdc,
char_buffer,
chars_filled,
Bounds.Width);
//пересчитываем selection
if ((select_first >= current_char_offset) && (select_first <= current_char_offset + new_line.CharLength - 1))
{
//начало selection попадает в строку
select_line_first = select_first - current_char_offset;
select_line_last = new_line.CharLength - 1;
}
if ((select_last >= current_char_offset) && (select_last <= current_char_offset + new_line.CharLength - 1))
{
//конец selection попадает в строку
select_line_last = select_last - current_char_offset;
}
if ((select_first <= current_char_offset) && (select_last >= current_char_offset + new_line.CharLength - 1))
{
//весь selection попадает в строку
select_line_first = select_first - current_char_offset;
select_line_last = new_line.CharLength - 1;
}
//и рисуем
new_line.Render(select_line_first, select_line_last);
}
//прибавляем счетчики
current_char_offset = current_char_offset + new_line.CharLength;
current_Y = current_Y + line_height;
lines_info.Add(new_line);
TextRegion.Union(new Rectangle(new_line.ReferensePoint, new_line.Extent));
//если стоит признак конца файла, выходим
if (EOF)
{
break;
}
}
font_ptr = NativeGdi.SelectObject(hdc, old_font);
NativeGdi.DeleteObject(font_ptr);
//NativeGdi.DeleteObject(old_font);
NativeGdi.SetTextAlign(hdc, old_align);
NativeGdi.GdiFlush(); //возможно не обязательно
dev.ReleaseHdc();
//g.ReleaseHdc(hdc);
}
/// <summary>
/// without render, only calc lines layout
/// </summary>
/// <param name="dev"></param>
public void CalcLines(IDeviceContext dev, int max_lines_to_calc)
{
//освобождаем имеющиеся строки
free_lines();
if (TextRegion != null)
{
TextRegion.Dispose();
}
TextRegion = new Region();
IntPtr hdc = dev.GetHdc();
IntPtr font_ptr = Font.ToHfont();
IntPtr old_font = NativeGdi.SelectObject(hdc, font_ptr);
uint old_align = NativeGdi.SetTextAlign(hdc, 0);
int line_height = (int)Math.Ceiling(Font.GetHeight());
IntPtr char_buffer = IntPtr.Zero;
bool EOF = false;
int chars_filled = 0;
int current_char_offset = 0;
int current_Y = 0;
int current_line_index = 0;
while (current_line_index < max_lines_to_calc)
{
OnFetchCharsToScreen
(current_char_offset,
true,
out char_buffer,
out chars_filled,
out EOF);
LineInfoSS new_line = new LineInfoSS();
new_line.ReferensePoint = new Point(Bounds.X, Bounds.Y + current_Y);
new_line.CharFirst = current_char_offset;
//обсчитываем
if (chars_filled != 0)
{
new_line.PrepareLayout
(hdc,
char_buffer,
chars_filled,
Bounds.Width);
}
//прибавляем счетчики
current_char_offset = current_char_offset + new_line.CharLength;
current_Y = current_Y + line_height;
current_line_index++;
lines_info.Add(new_line);
TextRegion.Union(new Rectangle(new_line.ReferensePoint, new_line.Extent));
//если стоит признак конца файла, выходим
if (EOF)
{
break;
}
}
font_ptr = NativeGdi.SelectObject(hdc, old_font);
NativeGdi.DeleteObject(font_ptr);
NativeGdi.SetTextAlign(hdc, old_align);
dev.ReleaseHdc();
}
