/*
===========================================================================

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company. 

This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).  

Doom 3 Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Doom 3 Source Code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/




#include "DeviceContext.h"
#include "Window.h"
#include "UserInterfaceLocal.h"
#include "FieldWindow.h"


void idFieldWindow::CommonInit() {
	cursorPos = 0;
	lastTextLength = 0;
	lastCursorPos = 0;
	paintOffset = 0;
	showCursor = false;
}

idFieldWindow::idFieldWindow(idDeviceContext *d, idUserInterfaceLocal *g) : idWindow(d, g) {
	dc = d;
	gui = g;
	CommonInit();
}

idFieldWindow::idFieldWindow(idUserInterfaceLocal *g) : idWindow(g) {
	gui = g;
	CommonInit();
}

idFieldWindow::~idFieldWindow() {

}

bool idFieldWindow::ParseInternalVar(const char *_name, idParser *src) {
	if (idStr::Icmp(_name, "cursorvar") == 0) {
		ParseString(src, cursorVar);
		return true;
	}
	if (idStr::Icmp(_name, "showcursor") == 0) {
		showCursor = src->ParseBool();
		return true;
	}
	return idWindow::ParseInternalVar(_name, src);
}


void idFieldWindow::CalcPaintOffset(int len) {
	lastCursorPos = cursorPos;
	lastTextLength = len;
	paintOffset = 0;
	const int textAdjust = static_cast<int>( textspacing );
	int tw = dc->TextWidth( text, textScale, -1, textAdjust );
	if (tw < textRect.w) {
		return;
	}
	while (tw > textRect.w && len > 0) {
		tw = dc->TextWidth( text, textScale, --len, textAdjust );
		paintOffset++;
	}
}


void idFieldWindow::Draw(int time, float x, float y) {
	float scale = textScale;
	int len = text.Length();
	const int textAdjust = static_cast<int>( textspacing );
	const int style = static_cast<int>( textstyle );
	cursorPos = gui->State().GetInt( cursorVar );
	if (len != lastTextLength || cursorPos != lastCursorPos) {
		CalcPaintOffset(len);
	}
	idRectangle rect = textRect;
	if (paintOffset >= len) {
		paintOffset = 0;
	}
	if (cursorPos > len) {
		cursorPos = len;
	}
	// Retail Q4 uses authored textSpacing to choose the visible prefix, then draws the field text without extra spacing.
	dc->DrawText( &text[paintOffset], scale, 0, foreColor, rect, false, (( flags & WIN_FOCUS ) || showCursor ) ? cursorPos - paintOffset : -1, false, NULL, 0, 0, style );
}

