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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This 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 2 of the License, or
* (at your option) any later version.
*
* This software 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 this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
//
// TXLabel.h
//
// An TXLabel allows you to put up multiline text in a window with various
// alignments. The label must be big enough to contain the text - if not then
// it will be resized appropriately.
//
#ifndef __TXLABEL_H__
#define __TXLABEL_H__
#include <stdlib.h>
#include "TXWindow.h"
#include <rfb/util.h>
class TXLabel : public TXWindow, public TXEventHandler {
public:
enum HAlign { left, centre, right };
enum VAlign { top, middle, bottom };
TXLabel(Display* dpy_, const char* text_, TXWindow* parent_=0,
int w=1, int h=1, HAlign ha=centre, VAlign va=middle)
: TXWindow(dpy_, w, h, parent_), lineSpacing(2), lines(0),
halign(ha), valign(va)
{
setEventHandler(this);
setText(text_);
addEventMask(ExposureMask);
}
// setText() changes the text in the label.
void setText(const char* text_) {
text.buf = safe_strdup(text_);
lines = 0;
int lineStart = 0;
int textWidth = 0;
int i = -1;
do {
i++;
if (text.buf[i] == '\n' || text.buf[i] == 0) {
int tw = XTextWidth(defaultFS, &text.buf[lineStart], i-lineStart);
if (tw > textWidth) textWidth = tw;
lineStart = i+1;
lines++;
}
} while (text.buf[i] != 0);
int textHeight = ((defaultFS->ascent + defaultFS->descent + lineSpacing)
* lines);
int newWidth = __rfbmax(width(), textWidth + xPad*2);
int newHeight = __rfbmax(height(), textHeight + yPad*2);
if (width() < newWidth || height() < newHeight) {
resize(newWidth, newHeight);
}
invalidate();
}
private:
int xOffset(int textWidth) {
switch (halign) {
case left: return xPad;
case right: return width() - xPad - textWidth;
default: return (width() - textWidth) / 2;
}
}
int yOffset(int lineNum) {
int textHeight = ((defaultFS->ascent + defaultFS->descent + lineSpacing)
* lines);
int lineOffset = ((defaultFS->ascent + defaultFS->descent + lineSpacing)
* lineNum + defaultFS->ascent);
switch (valign) {
case top: return yPad + lineOffset;
case bottom: return height() - yPad - textHeight + lineOffset;
default: return (height() - textHeight) / 2 + lineOffset;
}
}
void paint() {
int lineNum = 0;
int lineStart = 0;
int i = -1;
do {
i++;
if (text.buf[i] == '\n' || text.buf[i] == 0) {
int tw = XTextWidth(defaultFS, &text.buf[lineStart], i-lineStart);
XDrawString(dpy, win(), defaultGC, xOffset(tw), yOffset(lineNum),
&text.buf[lineStart], i-lineStart);
lineStart = i+1;
lineNum++;
}
} while (text.buf[i] != 0);
}
virtual void handleEvent(TXWindow* w, XEvent* ev) {
switch (ev->type) {
case Expose:
paint();
break;
}
}
int lineSpacing;
rfb::CharArray text;
int lines;
HAlign halign;
VAlign valign;
};
#endif
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