void CalculateTab(ThemedDocumentPageHandler tab, int i, ref float posx)
{
var textSize = string.IsNullOrEmpty(tab.Text) ? Size.Empty : Size.Ceiling(Font.MeasureString(tab.Text));
var size = textSize;
var prevnextsel = mousePos.X > nextPrevWidth || i == -1;
var textoffset = 0;
if (tab.Image != null)
{
textoffset = tab.Image.Size.Width + TabPadding.Left;
size.Width += textoffset;
}
var closesize = tabDrawable.Height / 2;
var tabRect = new RectangleF(posx, 0, size.Width + (tab.Closable ? closesize + TabPadding.Horizontal + TabPadding.Right : TabPadding.Horizontal), tabDrawable.Height);
if (i == selectedIndex && draggingLocation != null)
{
tabRect.Offset(mousePos.X - draggingLocation.Value.X, 0);
}
tab.Rect = tabRect;
tab.CloseRect = new RectangleF(tabRect.X + tab.Rect.Width - tabDrawable.Height / 4 - closesize, tabDrawable.Height / 4, closesize, closesize);
tab.TextRect = new RectangleF(tabRect.X + TabPadding.Left + textoffset, (tabDrawable.Height - size.Height) / 2, textSize.Width, textSize.Height);
posx += tab.Rect.Width;
}
/// <summary>
/// Initializes a new instance of the <see cref="T:Eto.Forms.ThemedControls.ThemedDocumentControlHandler"/> class.
/// </summary>
public ThemedDocumentControlHandler()
{
mousePos = new PointF(-1, -1);
selectedIndex = -1;
nextPrevWidth = 0;
startx = 0;
font = SystemFonts.Default();
tabDrawable = new Drawable();
contentPanel = new Panel();
tabPrev = new ThemedDocumentPageHandler {
Text = "<", Closable = false
};
tabNext = new ThemedDocumentPageHandler {
Text = ">", Closable = false
};
tabDrawable.MouseMove += Drawable_MouseMove;
tabDrawable.MouseLeave += Drawable_MouseLeave;
tabDrawable.MouseDown += Drawable_MouseDown;
tabDrawable.Paint += Drawable_Paint;
tabDrawable.MouseUp += Drawable_MouseUp;
Control = new TableLayout(tabDrawable, contentPanel);
Control.SizeChanged += Widget_SizeChanged;
}
internal void Update(ThemedDocumentPageHandler handler)
{
Calculate();
var index = pages.FindIndex(obj => ReferenceEquals(obj.Handler, handler));
if (index != -1)
{
if (SelectedIndex == index)
{
SetPageContent();
}
else
{
tabDrawable.Invalidate();
}
}
}
void DrawTab(Graphics g, ThemedDocumentPageHandler tab, int i)
{
var prevnextsel = mousePos.X > nextPrevWidth || i == -1;
var closeSelected = IsCloseSelected(tab);
var tabRect = tab.Rect;
var textRect = tab.TextRect;
var closerect = tab.CloseRect;
var closemargin = closerect.Height / 3;
var size = tabRect.Size;
var textcolor = Enabled ? SystemColors.ControlText : SystemColors.DisabledText;
var backcolor = SystemColors.Control;
if (selectedIndex >= 0 && i == selectedIndex)
{
textcolor = Enabled ? SystemColors.HighlightText : SystemColors.DisabledText;
backcolor = SystemColors.Highlight;
backcolor.A *= 0.8f;
}
if (draggingLocation == null && tabRect.Contains(mousePos) && prevnextsel && !closeSelected && Enabled)
{
textcolor = SystemColors.HighlightText;
backcolor = SystemColors.Highlight;
}
g.FillRectangle(backcolor, tabRect);
if (tab.Image != null)
{
var imageSize = tab.Image.Size;
g.DrawImage(tab.Image, tabRect.X + TabPadding.Left + (maxImageSize.Width - imageSize.Width) / 2, (tabDrawable.Height - imageSize.Height) / 2);
}
g.DrawText(Font, textcolor, textRect.Location, tab.Text);
if (tab.Closable)
{
g.FillRectangle(closeSelected ? SystemColors.Highlight : SystemColors.Control, closerect);
var closeForeground = Enabled ? closeSelected ? SystemColors.HighlightText : SystemColors.ControlText : SystemColors.DisabledText;
g.DrawLine(closeForeground, closerect.X + closemargin, closerect.Y + closemargin, closerect.X + closerect.Width - 1 - closemargin, closerect.Y + closerect.Height - 1 - closemargin);
g.DrawLine(closeForeground, closerect.X + closemargin, closerect.Y + closerect.Height - 1 - closemargin, closerect.X + closerect.Width - 1 - closemargin, closerect.Y + closemargin);
}
}
bool IsCloseSelected(ThemedDocumentPageHandler tab)
{
var prevnextsel = mousePos.X > nextPrevWidth;
return(draggingLocation == null && tab.Closable && tab.CloseRect.Contains(mousePos) && prevnextsel && Enabled);
}