Solution by the OP
I managed to partially solve custom drawing, by defining a TFont variable, and using SelectObject
and setTextColor
. Setting font color and style works, but setting the font size doesn't.
var
nFont: TFont;
begin
DC := TntTreeView1.Canvas.Handle;
NFont := TFont.Create;
// rest of the code here ...
// i tried to set nFont.Size, but it doesn't seem to work
nFont.Size := 7;
nFont.Color := colorToRGB(clBlue);
nFont.Style := TntTreeview1.Font.Style + [fsBold];
SelectObject(DC,NFont.Handle);
SetTextColor(DC,colortoRGB(clBlue));
DrawTextW(
DC,
PWideChar(nData.nodeLabel),
Length(nData.nodeLabel),
ExtraLabelRect,
DT_LEFT or DT_VCENTER
);
// rest of the code here
end;
Source: I used the idea from here
Update 2
I solved the second problem by setting the treeview's RowSelect
property to true.
For this, to work, i had to set the ShowLines
property to false, and custom draw the lines and the buttons. It works now.
Update 3
I improved the solution for the first problem, by not creating a new font, but selecting the canvas font for displaying text, and this way i was able to change any aspect of the font, and the system cleartype settings are also applied:
// set font size for the canvas font (font style can be set the same time)
TntTreeView1.Canvas.Font.Size := 7;
// select canvas font for DC
SelectObject(DC,TntTreeView1.Canvas.Font.Handle);
// set font color
SetTextColor(DC,colortoRGB(clBlue));