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127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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//
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// TXLabel.h
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//
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// An TXLabel allows you to put up multiline text in a window with various
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// alignments. The label must be big enough to contain the text - if not then
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// it will be resized appropriately.
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//
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#ifndef __TXLABEL_H__
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#define __TXLABEL_H__
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#include <stdlib.h>
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#include "TXWindow.h"
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#include <rfb/util.h>
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class TXLabel : public TXWindow, public TXEventHandler {
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public:
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enum HAlign { left, centre, right };
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enum VAlign { top, middle, bottom };
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TXLabel(Display* dpy_, const char* text_, TXWindow* parent_=0,
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int w=1, int h=1, HAlign ha=centre, VAlign va=middle)
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: TXWindow(dpy_, w, h, parent_), lineSpacing(2), lines(0),
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halign(ha), valign(va)
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{
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setEventHandler(this);
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setText(text_);
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addEventMask(ExposureMask);
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}
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// setText() changes the text in the label.
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void setText(const char* text_) {
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text.buf = rfb::strDup(text_);
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lines = 0;
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int lineStart = 0;
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int textWidth = 0;
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int i = -1;
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do {
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i++;
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if (text.buf[i] == '\n' || text.buf[i] == 0) {
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int tw = XTextWidth(defaultFS, &text.buf[lineStart], i-lineStart);
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if (tw > textWidth) textWidth = tw;
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lineStart = i+1;
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lines++;
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}
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} while (text.buf[i] != 0);
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int textHeight = ((defaultFS->ascent + defaultFS->descent + lineSpacing)
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* lines);
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int newWidth = __rfbmax(width(), textWidth + xPad*2);
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int newHeight = __rfbmax(height(), textHeight + yPad*2);
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if (width() < newWidth || height() < newHeight) {
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resize(newWidth, newHeight);
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}
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invalidate();
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}
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private:
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int xOffset(int textWidth) {
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switch (halign) {
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case left: return xPad;
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case right: return width() - xPad - textWidth;
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default: return (width() - textWidth) / 2;
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}
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}
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int yOffset(int lineNum) {
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int textHeight = ((defaultFS->ascent + defaultFS->descent + lineSpacing)
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* lines);
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int lineOffset = ((defaultFS->ascent + defaultFS->descent + lineSpacing)
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* lineNum + defaultFS->ascent);
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switch (valign) {
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case top: return yPad + lineOffset;
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case bottom: return height() - yPad - textHeight + lineOffset;
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default: return (height() - textHeight) / 2 + lineOffset;
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}
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}
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void paint() {
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int lineNum = 0;
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int lineStart = 0;
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int i = -1;
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do {
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i++;
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if (text.buf[i] == '\n' || text.buf[i] == 0) {
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int tw = XTextWidth(defaultFS, &text.buf[lineStart], i-lineStart);
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XDrawString(dpy, win(), defaultGC, xOffset(tw), yOffset(lineNum),
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&text.buf[lineStart], i-lineStart);
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lineStart = i+1;
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lineNum++;
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}
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} while (text.buf[i] != 0);
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}
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virtual void handleEvent(TXWindow* w, XEvent* ev) {
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switch (ev->type) {
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case Expose:
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paint();
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break;
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}
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}
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int lineSpacing;
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rfb::CharArray text;
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int lines;
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HAlign halign;
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VAlign valign;
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};
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#endif
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