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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.
*/
//
// TXCheckbox.h
//
// A TXCheckbox has a box which may be "checked" with some text next to it.
// The checkbox window must be big enough to contain the text - if not then it
// will be resized appropriately.
//
// There are two styles of checkbox: the normal style which uses a tick in a
// square box, and the radio style which uses a dot inside a circle. The
// default behaviour when clicking on the checkbox is to toggle it on or off,
// but this behaviour can be changed by the callback object. In particular to
// get radiobutton behaviour, the callback must ensure that only one of a set
// of radiobuttons is selected.
//
#ifndef __TXCHECKBOX_H__
#define __TXCHECKBOX_H__
#include "TXWindow.h"
#include <rfb/util.h>
// TXCheckboxCallback's checkboxSelect() method is called when the state of a
// checkbox changes.
class TXCheckbox;
class TXCheckboxCallback {
public:
virtual void checkboxSelect(TXCheckbox* checkbox)=0;
};
class TXCheckbox : public TXWindow, public TXEventHandler {
public:
TXCheckbox(Display* dpy_, const char* text_, TXCheckboxCallback* cb_,
bool radio_=false, TXWindow* parent_=0, int w=1, int h=1)
: TXWindow(dpy_, w, h, parent_), cb(cb_), text(0),
boxSize(radio_ ? 12 : 13), boxPad(4),
checked_(false), disabled_(false), radio(radio_)
{
setEventHandler(this);
setText(text_);
gc = XCreateGC(dpy, win(), 0, 0);
XSetFont(dpy, gc, defaultFont);
addEventMask(ExposureMask| ButtonPressMask | ButtonReleaseMask);
}
virtual ~TXCheckbox() {
XFreeGC(dpy, gc);
if (text) free(text);
}
// setText() changes the text in the checkbox.
void setText(const char* text_) {
if (text) free(text);
text = strdup((char*)text_);
int textWidth = XTextWidth(defaultFS, text, strlen(text));
int textHeight = (defaultFS->ascent + defaultFS->descent);
int newWidth = __rfbmax(width(), textWidth + xPad*2 + boxPad*2 + boxSize);
int newHeight = __rfbmax(height(), textHeight + yPad*2);
if (width() < newWidth || height() < newHeight) {
resize(newWidth, newHeight);
}
}
// checked() sets or queries the state of the checkbox
void checked(bool b) { checked_ = b; paint(); }
bool checked() { return checked_; }
// disabled() sets or queries the disabled state of the checkbox. A disabled
// checkbox cannot be changed via the user interface.
void disabled(bool b) { disabled_ = b; paint(); }
bool disabled() { return disabled_; }
private:
void paint() {
if (disabled_)
drawBevel(gc, xPad + boxPad, (height() - boxSize) / 2, boxSize, boxSize,
bevel, disabledBg, darkBg, lightBg, radio);
else
drawBevel(gc, xPad + boxPad, (height() - boxSize) / 2, boxSize, boxSize,
bevel, enabledBg, darkBg, lightBg, radio);
XSetBackground(dpy, gc, disabled_ ? disabledBg : enabledBg);
XSetForeground(dpy, gc, disabled_ ? disabledFg : defaultFg);
if (checked_) {
Pixmap icon = radio ? dot : tick;
int iconSize = radio ? dotSize : tickSize;
XCopyPlane(dpy, icon, win(), gc, 0, 0, iconSize, iconSize,
xPad + boxPad + (boxSize - iconSize) / 2,
(height() - iconSize) / 2, 1);
}
XDrawString(dpy, win(), gc, xPad + boxSize + boxPad*2,
(height() + defaultFS->ascent - defaultFS->descent) / 2,
text, strlen(text));
}
virtual void handleEvent(TXWindow* w, XEvent* ev) {
switch (ev->type) {
case Expose:
paint();
break;
case ButtonPress:
break;
case ButtonRelease:
if (ev->xbutton.x >= 0 && ev->xbutton.x < width() &&
ev->xbutton.y >= 0 && ev->xbutton.y < height()) {
if (!disabled_) {
checked_ = !checked_;
if (cb) cb->checkboxSelect(this);
paint();
}
}
break;
}
}
TXCheckboxCallback* cb;
GC gc;
char* text;
int boxSize;
int boxPad;
bool checked_;
bool disabled_;
bool radio;
};
#endif
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