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Home » U++ Library support » LineEdit, EditFields, DocEdit » [BUG] LineEdit text renderer fails to correctly highlight underlined text .

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[BUG] LineEdit text renderer fails to correctly highlight underlined text . [message #57247]

Wed, 16 June 2021 15:10

Oblivion
Messages: 1206
Registered: August 2007

Senior Contributor

Hi,

The problem: sOptimizedTextRenderer fails to render text attributes correctly on some cases (if underline attribute is involved).

Reason seems to be the non-continous text chunk rendering. When some underline text have other text with no underline attribute in between, the renderer does not erase the underline correctly.

Sscreenshot:

index.php?t=getfile&id=6471&private=0

Test code:

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

struct MyLineEdit : LineEdit {
	void  HighlightLine(int, Vector<Highlight>& hl, int64) override {
		for(Highlight& h : hl) {
			h.font.Underline(h.chr == 'U');
			h.font.Bold(h.chr == 'B');
			h.font.Italic(h.chr == 'I');
		}
	};
};
struct MyApp : TopWindow {
	MyLineEdit edit;
	MyApp()
	{
		Sizeable().Zoomable().CenterScreen().SetRect(0,0, 1024, 800);
		Add(edit.SizePos());
		edit.SetFont(Monospace().Height(32));
		edit.Append(WString("UUU BBB III BBB\n"));
		edit.Append(WString("UUU BBB III UUU\n")); // Fail: Draws underline in between even if the underline attribute is disabled.
	}
};

GUI_APP_MAIN
{
	MyApp().Run();
}

Best regards,
Oblivion