summaryrefslogtreecommitdiffstats
path: root/kview/kviewcanvas/kimagecanvas.h
blob: 52b49aca221b4e001d43285a9a4b5a1859c8e452 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
/*  This file is part of the KDE project
    Copyright (C) 2001-2002 Matthias Kretz <kretz@kde.org>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2
    as published by the Free Software Foundation.

    This program 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 program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/
// $Id$

#ifndef _KIMAGECANVAS_H
#define _KIMAGECANVAS_H

#include "kimageviewer/canvas.h"

#include <tqscrollview.h>
#include <tqwmatrix.h>
#include <tqcursor.h>
#include <tqrect.h>

#include <kdemacros.h>

class KImageHolder;
class TQColor;
class TQImage;
class KPixmap;

/**
 * @short KViewCanvas
 * @author Matthias Kretz <kretz@kde.org>
 * @version $Id$
 */
class KDE_EXPORT KImageCanvas : public TQScrollView, public KImageViewer::Canvas
{
	Q_OBJECT
  TQ_OBJECT
	public:
		/**
		 * KImageCanvas Constructor
		 */
		KImageCanvas( TQWidget * parent, const char * name, const TQStringList & args );

		/**
		 * KImageCanvas Destructor
		 */
		virtual ~KImageCanvas();

		/**
		 * set the background color of the canvas
		 */
		void setBgColor( const TQColor & );

		/**
		 * returns the current background color
		 */
		const TQColor & bgColor() const;

		/**
		 * the depth of the contained image
		 */
		int imageDepth() const;

		/**
		 * the size of the unzoomed image
		 */
		TQSize imageSize() const;

		/**
		 * the size of the zoomed (current) image
		 */
		TQSize currentSize() const;

		/**
		 * returns the zoom factor
		 */
		double zoom() const { return m_zoom; }

		/**
		 * returns the current (unzoomed) image
		 */
		const TQImage * image() const;

		/**
		 * Scrolls the content so that the point (x, y) is in the top-left corner.
		 */
		void setXYOffset( int x, int y ) { setContentsPos( x, y ); }

		/**
		 * Returns the leftmost visible X coordinate of the image.
		 */
		int xOffset() const { return contentsX(); }

		/**
		 * Returns the topmost visible Y coordinate of the image.
		 */
		int yOffset() const { return contentsY(); }

		/**
		 * Returns whether to use fast or smooth scaling
		 */
		bool fastScale() const { return m_fastscale; }

		/**
		 * Return whether the image should always be centered.
		 */
		bool centered() const { return m_bCentered; }

		/**
		 * Return the selected rectangle
		 */
		TQRect selection() const;

		/**
		 * Returns whether the aspect ratio of the image is kept
		 */
		bool keepAspectRatio() const { return m_keepaspectratio; }

		/**
		 * @return the number of available blend effects
		 */
		unsigned int numOfBlendEffects() const;

		/**
		 * @return the description of the blend effect
		 */
		TQString blendEffectDescription( unsigned int ) const;

		/**
		 * @return the current maximum image size
		 */
		const TQSize & maximumImageSize() const { return m_maxsize; }

		/**
		 * @return the current minimum image size
		 */
		const TQSize & minimumImageSize() const { return m_minsize; }

		/**
		 * @return a pointer to the TQWidget interface of this object
		 */
		TQWidget * widget() { return static_cast<TQWidget *>( this ); }

		bool eventFilter( TQObject *, TQEvent * );

	signals:
		/**
		 * a mouse button was pressed and a context menu should be openend
		 */
		void contextPress( const TQPoint& );

		/**
		 * the size of the image has changed (a new image was loaded, or the
		 * image was zoomed or cropped)
		 *
		 * it passes the new size of the image
		 */
		void imageSizeChanged( const TQSize & );

		/**
		 * The zoom of the image has changed.
		 */
		void zoomChanged( double zoom );

		/**
		 * The selection has changed. Connect to this signal if you want to
		 * do something with a selection of the image (e.g. crop).
		 */
		void selectionChanged( const TQRect & );

		/**
		 * Emitted when an image is finished being shown. If a blend effect is being used
		 * the signal is emitted when the effect is finished.
		 */
		void showingImageDone();

		/**
		 * This signal is emitted whenever the canvas changes between image/no-image. For
		 * example, if someone calls @ref clear() hasImage( false ) is emitted if an image
		 * was shown before.
		 */
		void hasImage( bool );

		/**
		 * Some methods of the canvas not only change the way the image is shown (e.g. zoom)
		 * but also change the image itself (e.g. rotation) - @ref image() returns something
		 * different. If such a change happens this signal is emitted.
		 * It is not emitted when a new image is set with the @ref setImage() methods.
		 */
		void imageChanged();

		/**
		 * The current mouse cursor position on the image.
		 */
		void cursorPos( const TQPoint & );

	public slots:
		/**
		 * Set if the image should always be centered if the canvas is
		 * bigger than the image.
		 */
		void setCentered( bool );

		/**
		 * give the canvas a new image to show. The zoom level is kept.
		 */
		void setImage( const TQImage & );

		/**
		 * Give the canvas a new image to show.
		 *
		 * You have to pass the size the image should have when it appears
		 * on screen.
		 */
		void setImage( const TQImage &, const TQSize & );

		/**
		 * set the zoom to be used when showing the image
		 */
		void setZoom( double );

		/**
		 * Fit the image into the requested width and height.
		 */
		void boundImageTo( const TQSize & size );

		/**
		 * Set the maximum size of the image. If this is set the image will
		 * never exceed this size.
		 *
		 * If you set this to 0x0 the image size may be as big as possible
		 */
		void setMaximumImageSize( const TQSize & );

		/**
		 * Set the minimum size of the image. If this is set the image will
		 * never be smaller than this size.
		 *
		 * If you set this to 0x0 the image size can be as small as possible
		 */
		void setMinimumImageSize( const TQSize & );

		/**
		 * Resize the image to the given size. It will keep the aspect ratio
		 * as long as keepAspectRatio is true (default). The image will be as
		 * large as possible within the given constraints.
		 */
		void resizeImage( const TQSize & );

		/**
		 * Hides the scrollbars of the canvas. It's still possible to scroll
		 * by moving the image with the mouse.
		 */
		void hideScrollbars( bool );

		/**
		 * Changes the zoom behaviour: Normally the aspect ratio of the image
		 * won't change, but if you want to allow it you may do.
		 */
		void setKeepAspectRatio( bool );

		/**
		 * If the canvas supports different methods for scaling you may
		 * switch between fast and smooth scaling.
		 *
		 * It defaults to smooth scaling.
		 */
		void setFastScale( bool );

		/**
		 * clears the canvas (no image loaded)
		 */
		void clear();

		/**
		 * flip the image horizontally
		 */
		void flipHorizontal( bool change = false );

		/**
		 * flip the image vertically
		 */
		void flipVertical( bool change = false );

		/**
		 * rotate the image a degrees counterclockwise
		 */
		void rotate( double a, bool change = false );

	protected:
		void checkBounds( TQSize & newsize );
		void zoomFromSize( const TQSize & );
		void sizeFromZoom( double );
		void updateImage();

		void mouseMoveEvent( TQMouseEvent * );
		void resizeEvent( TQResizeEvent * );
		void contentsMousePressEvent( TQMouseEvent * );
		void contentsWheelEvent( TQWheelEvent * );
		void keyPressEvent( TQKeyEvent * );
		void timerEvent( TQTimerEvent * );

	protected slots:
		void slotUpdateImage();
		void hideCursor();
		void slotImageChanged();
		void loadSettings();

	private slots:
		void selected( const TQRect & ); // map rect to unzoomed rect
		void mapCursorPos( const TQPoint & );

	private:
		enum BlendEffect {
			NoBlending = 0,
			WipeFromLeft = 1,
			WipeFromRight = 2,
			WipeFromTop = 3,
			WipeFromBottom = 4,
			AlphaBlend = 5
		};
		const KPixmap pixmap();
		void sizeChanged();
		void matrixChanged();
		void center();
		void finishNewClient();
		KImageHolder * createNewClient();

		KImageHolder * m_client;
		KImageHolder * m_oldClient;
		TQImage * m_image; //unzoomed copy of the current image
		TQImage * m_imageTransformed; //xForm( m_matrix ) copy of the current image
		KPixmap * m_pixmap; //copy of the current pixmap (if ( m_fastscale ) it's unzoomed else it's m_imageTransformed.smoothScale()d)

		TQTimer * m_pTimer; // timer for single shot to hide the cursor
		TQCursor m_cursor; // the cursor show in the canvas (for auto-hiding)

		TQWMatrix m_matrix; // the current transformation matrix
		TQSize m_maxsize, m_minsize;
		TQSize m_currentsize;

		double m_zoom;
		bool m_fastscale;
		bool m_keepaspectratio;
		bool m_bImageChanged;
		bool m_bSizeChanged;
		bool m_bMatrixChanged;
		bool m_bNeedNewPixmap;
		bool m_bCentered;
		bool m_bImageUpdateScheduled;
		bool m_bNewImage;
		int m_iBlendTimerId;

		TQRect m_selection; //unzoomed selection rect
};

// vim:sw=4:ts=4

#endif // _KIMAGECANVAS_H