/// <summary>
/// Gets metrics for this flow.
/// </summary>
private _Metrics _GetMetrics()
{
if (this._MetricsCache == null)
{
return this._MetricsCache = this._CreateMetrics();
}
return this._MetricsCache;
}
SIZE _Measure(int maxWidth)
{
SIZE R = default;
_z?.Dispose();
_z = new _Metrics(this);
int buttonPlusX = (_z.bBorder + _z.textPaddingX) * 2 + _z.check + _z.image + _z.submenu + _z.submenuMargin;
int buttonPlusY = (_z.bBorder + _z.textPaddingY) * 2 + 1;
int maxTextWidth = maxWidth - buttonPlusX;
var font = NativeFont_.RegularCached(_dpi);
using var dc = new FontDC_(font);
int lineHeight = dc.MeasureEP(" ").height + buttonPlusY;
int maxHotkey = 0;
if (_z.hasHotkeys)
{
foreach (var b in _a)
{
if (b.Hotkey == null)
{
continue;
}
int wid = dc.MeasureDT(b.Hotkey, c_tffHotkey).width;
maxHotkey = Math.Max(maxHotkey, Math.Min(wid, maxTextWidth / 2));
}
}
int hotkeyPlus = lineHeight * 3 / 2; //space between text and hotkey
if (maxHotkey > 0)
{
maxTextWidth -= maxHotkey += hotkeyPlus;
}
int y = 0;
for (int i = 0; i < _a.Count; i++)
{
//note: to support multiline, wrap, underlines and tabs we have to use DrawText, not TextOut.
// DrawText(DT_CALCRECT) is slow. Very slow compared with GetTextExtentPoint32. Eg 100-300 ms for 1000 items. Depends on text length.
var b = _a[i];
SIZE z;
if (b.IsSeparator)
{
z = new(0, _z.separator);
}
else
{
var s = b.Text;
if (!s.NE())
{
if (b.FontBold)
{
Api.SelectObject(dc, NativeFont_.BoldCached(_dpi));
}
z = dc.MeasureDT(s, _TfFlags(b), maxTextWidth);
z.width = Math.Min(z.width, maxTextWidth);
if (b.FontBold)
{
Api.SelectObject(dc, font);
}
_z.xTextEnd = Math.Max(_z.xTextEnd, z.width);
z.width += buttonPlusX; z.height += buttonPlusY;
}
else
{
z = new(0, lineHeight);
}
}
b.rect = new(0, y, z.width, z.height);
y += z.height;
R.width = Math.Max(R.width, z.width);
R.height = Math.Max(R.height, y);
}
if (maxHotkey > 0)
{
R.width += maxHotkey;
_z.xHotkeyStart = _z.xTextEnd + hotkeyPlus;
}
foreach (var b in _a)
{
b.rect.right = R.width;
}
return(R);
}