source: ntrip/trunk/BNC/qwt/qwt_magnifier.cpp@ 5296

Last change on this file since 5296 was 4271, checked in by mervart, 12 years ago
File size: 11.0 KB
Line 
1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#include "qwt_magnifier.h"
11#include "qwt_math.h"
12#include <qevent.h>
13#include <qwidget.h>
14
15class QwtMagnifier::PrivateData
16{
17public:
18 PrivateData():
19 isEnabled( false ),
20 wheelFactor( 0.9 ),
21 wheelButtonState( Qt::NoButton ),
22 mouseFactor( 0.95 ),
23 mouseButton( Qt::RightButton ),
24 mouseButtonState( Qt::NoButton ),
25 keyFactor( 0.9 ),
26 zoomInKey( Qt::Key_Plus ),
27 zoomOutKey( Qt::Key_Minus ),
28 zoomInKeyModifiers( Qt::NoModifier ),
29 zoomOutKeyModifiers( Qt::NoModifier ),
30 mousePressed( false )
31 {
32 }
33
34 bool isEnabled;
35
36 double wheelFactor;
37 int wheelButtonState;
38
39 double mouseFactor;
40 int mouseButton;
41 int mouseButtonState;
42
43 double keyFactor;
44 int zoomInKey;
45 int zoomOutKey;
46 int zoomInKeyModifiers;
47 int zoomOutKeyModifiers;
48
49 bool mousePressed;
50 bool hasMouseTracking;
51 QPoint mousePos;
52};
53
54/*!
55 Constructor
56 \param parent Widget to be magnified
57*/
58QwtMagnifier::QwtMagnifier( QWidget *parent ):
59 QObject( parent )
60{
61 d_data = new PrivateData();
62 setEnabled( true );
63}
64
65//! Destructor
66QwtMagnifier::~QwtMagnifier()
67{
68 delete d_data;
69}
70
71/*!
72 \brief En/disable the magnifier
73
74 When enabled is true an event filter is installed for
75 the observed widget, otherwise the event filter is removed.
76
77 \param on true or false
78 \sa isEnabled(), eventFilter()
79*/
80void QwtMagnifier::setEnabled( bool on )
81{
82 if ( d_data->isEnabled != on )
83 {
84 d_data->isEnabled = on;
85
86 QObject *o = parent();
87 if ( o )
88 {
89 if ( d_data->isEnabled )
90 o->installEventFilter( this );
91 else
92 o->removeEventFilter( this );
93 }
94 }
95}
96
97/*!
98 \return true when enabled, false otherwise
99 \sa setEnabled(), eventFilter()
100*/
101bool QwtMagnifier::isEnabled() const
102{
103 return d_data->isEnabled;
104}
105
106/*!
107 \brief Change the wheel factor
108
109 The wheel factor defines the ratio between the current range
110 on the parent widget and the zoomed range for each step of the wheel.
111 The default value is 0.9.
112
113 \param factor Wheel factor
114 \sa wheelFactor(), setWheelButtonState(),
115 setMouseFactor(), setKeyFactor()
116*/
117void QwtMagnifier::setWheelFactor( double factor )
118{
119 d_data->wheelFactor = factor;
120}
121
122/*!
123 \return Wheel factor
124 \sa setWheelFactor()
125*/
126double QwtMagnifier::wheelFactor() const
127{
128 return d_data->wheelFactor;
129}
130
131/*!
132 Assign a mandatory button state for zooming in/out using the wheel.
133 The default button state is Qt::NoButton.
134
135 \param buttonState Button state
136 \sa wheelButtonState()
137*/
138void QwtMagnifier::setWheelButtonState( int buttonState )
139{
140 d_data->wheelButtonState = buttonState;
141}
142
143/*!
144 \return Wheel button state
145 \sa setWheelButtonState()
146*/
147int QwtMagnifier::wheelButtonState() const
148{
149 return d_data->wheelButtonState;
150}
151
152/*!
153 \brief Change the mouse factor
154
155 The mouse factor defines the ratio between the current range
156 on the parent widget and the zoomed range for each vertical mouse movement.
157 The default value is 0.95.
158
159 \param factor Wheel factor
160 \sa mouseFactor(), setMouseButton(), setWheelFactor(), setKeyFactor()
161*/
162void QwtMagnifier::setMouseFactor( double factor )
163{
164 d_data->mouseFactor = factor;
165}
166
167/*!
168 \return Mouse factor
169 \sa setMouseFactor()
170*/
171double QwtMagnifier::mouseFactor() const
172{
173 return d_data->mouseFactor;
174}
175
176/*!
177 Assign the mouse button, that is used for zooming in/out.
178 The default value is Qt::RightButton.
179
180 \param button Button
181 \param buttonState Button state
182 \sa getMouseButton()
183*/
184void QwtMagnifier::setMouseButton( int button, int buttonState )
185{
186 d_data->mouseButton = button;
187 d_data->mouseButtonState = buttonState;
188}
189
190//! \sa setMouseButton()
191void QwtMagnifier::getMouseButton(
192 int &button, int &buttonState ) const
193{
194 button = d_data->mouseButton;
195 buttonState = d_data->mouseButtonState;
196}
197
198/*!
199 \brief Change the key factor
200
201 The key factor defines the ratio between the current range
202 on the parent widget and the zoomed range for each key press of
203 the zoom in/out keys. The default value is 0.9.
204
205 \param factor Key factor
206 \sa keyFactor(), setZoomInKey(), setZoomOutKey(),
207 setWheelFactor, setMouseFactor()
208*/
209void QwtMagnifier::setKeyFactor( double factor )
210{
211 d_data->keyFactor = factor;
212}
213
214/*!
215 \return Key factor
216 \sa setKeyFactor()
217*/
218double QwtMagnifier::keyFactor() const
219{
220 return d_data->keyFactor;
221}
222
223/*!
224 Assign the key, that is used for zooming in.
225 The default combination is Qt::Key_Plus + Qt::NoModifier.
226
227 \param key
228 \param modifiers
229 \sa getZoomInKey(), setZoomOutKey()
230*/
231void QwtMagnifier::setZoomInKey( int key, int modifiers )
232{
233 d_data->zoomInKey = key;
234 d_data->zoomInKeyModifiers = modifiers;
235}
236
237//! \sa setZoomInKey()
238void QwtMagnifier::getZoomInKey( int &key, int &modifiers ) const
239{
240 key = d_data->zoomInKey;
241 modifiers = d_data->zoomInKeyModifiers;
242}
243
244/*!
245 Assign the key, that is used for zooming out.
246 The default combination is Qt::Key_Minus + Qt::NoModifier.
247
248 \param key
249 \param modifiers
250 \sa getZoomOutKey(), setZoomOutKey()
251*/
252void QwtMagnifier::setZoomOutKey( int key, int modifiers )
253{
254 d_data->zoomOutKey = key;
255 d_data->zoomOutKeyModifiers = modifiers;
256}
257
258//! \sa setZoomOutKey()
259void QwtMagnifier::getZoomOutKey( int &key, int &modifiers ) const
260{
261 key = d_data->zoomOutKey;
262 modifiers = d_data->zoomOutKeyModifiers;
263}
264
265/*!
266 \brief Event filter
267
268 When isEnabled() the mouse events of the observed widget are filtered.
269
270 \param object Object to be filtered
271 \param event Event
272
273 \sa widgetMousePressEvent(), widgetMouseReleaseEvent(),
274 widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent()
275 widgetKeyReleaseEvent()
276*/
277bool QwtMagnifier::eventFilter( QObject *object, QEvent *event )
278{
279 if ( object && object == parent() )
280 {
281 switch ( event->type() )
282 {
283 case QEvent::MouseButtonPress:
284 {
285 widgetMousePressEvent( ( QMouseEvent * )event );
286 break;
287 }
288 case QEvent::MouseMove:
289 {
290 widgetMouseMoveEvent( ( QMouseEvent * )event );
291 break;
292 }
293 case QEvent::MouseButtonRelease:
294 {
295 widgetMouseReleaseEvent( ( QMouseEvent * )event );
296 break;
297 }
298 case QEvent::Wheel:
299 {
300 widgetWheelEvent( ( QWheelEvent * )event );
301 break;
302 }
303 case QEvent::KeyPress:
304 {
305 widgetKeyPressEvent( ( QKeyEvent * )event );
306 break;
307 }
308 case QEvent::KeyRelease:
309 {
310 widgetKeyReleaseEvent( ( QKeyEvent * )event );
311 break;
312 }
313 default:;
314 }
315 }
316 return QObject::eventFilter( object, event );
317}
318
319/*!
320 Handle a mouse press event for the observed widget.
321
322 \param mouseEvent Mouse event
323 \sa eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent()
324*/
325void QwtMagnifier::widgetMousePressEvent( QMouseEvent *mouseEvent )
326{
327 if ( ( mouseEvent->button() != d_data->mouseButton)
328 || parentWidget() == NULL )
329 {
330 return;
331 }
332
333 if ( ( mouseEvent->modifiers() & Qt::KeyboardModifierMask ) !=
334 ( int )( d_data->mouseButtonState & Qt::KeyboardModifierMask ) )
335 {
336 return;
337 }
338
339 d_data->hasMouseTracking = parentWidget()->hasMouseTracking();
340 parentWidget()->setMouseTracking( true );
341 d_data->mousePos = mouseEvent->pos();
342 d_data->mousePressed = true;
343}
344
345/*!
346 Handle a mouse release event for the observed widget.
347
348 \param mouseEvent Mouse event
349
350 \sa eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(),
351*/
352void QwtMagnifier::widgetMouseReleaseEvent( QMouseEvent *mouseEvent )
353{
354 Q_UNUSED( mouseEvent );
355
356 if ( d_data->mousePressed && parentWidget() )
357 {
358 d_data->mousePressed = false;
359 parentWidget()->setMouseTracking( d_data->hasMouseTracking );
360 }
361}
362
363/*!
364 Handle a mouse move event for the observed widget.
365
366 \param mouseEvent Mouse event
367 \sa eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(),
368*/
369void QwtMagnifier::widgetMouseMoveEvent( QMouseEvent *mouseEvent )
370{
371 if ( !d_data->mousePressed )
372 return;
373
374 const int dy = mouseEvent->pos().y() - d_data->mousePos.y();
375 if ( dy != 0 )
376 {
377 double f = d_data->mouseFactor;
378 if ( dy < 0 )
379 f = 1 / f;
380
381 rescale( f );
382 }
383
384 d_data->mousePos = mouseEvent->pos();
385}
386
387/*!
388 Handle a wheel event for the observed widget.
389
390 \param wheelEvent Wheel event
391 \sa eventFilter()
392*/
393void QwtMagnifier::widgetWheelEvent( QWheelEvent *wheelEvent )
394{
395 if ( ( wheelEvent->modifiers() & Qt::KeyboardModifierMask ) !=
396 ( int )( d_data->wheelButtonState & Qt::KeyboardModifierMask ) )
397 {
398 return;
399 }
400
401 if ( d_data->wheelFactor != 0.0 )
402 {
403 /*
404 A positive delta indicates that the wheel was
405 rotated forwards away from the user; a negative
406 value indicates that the wheel was rotated
407 backwards toward the user.
408 Most mouse types work in steps of 15 degrees,
409 in which case the delta value is a multiple
410 of 120 (== 15 * 8).
411 */
412 double f = qPow( d_data->wheelFactor,
413 qAbs( wheelEvent->delta() / 120 ) );
414
415 if ( wheelEvent->delta() > 0 )
416 f = 1 / f;
417
418 rescale( f );
419 }
420}
421
422/*!
423 Handle a key press event for the observed widget.
424
425 \param keyEvent Key event
426 \sa eventFilter(), widgetKeyReleaseEvent()
427*/
428void QwtMagnifier::widgetKeyPressEvent( QKeyEvent *keyEvent )
429{
430 const int key = keyEvent->key();
431 const int state = keyEvent->modifiers();
432
433 if ( key == d_data->zoomInKey &&
434 state == d_data->zoomInKeyModifiers )
435 {
436 rescale( d_data->keyFactor );
437 }
438 else if ( key == d_data->zoomOutKey &&
439 state == d_data->zoomOutKeyModifiers )
440 {
441 rescale( 1.0 / d_data->keyFactor );
442 }
443}
444
445/*!
446 Handle a key release event for the observed widget.
447
448 \param keyEvent Key event
449 \sa eventFilter(), widgetKeyReleaseEvent()
450*/
451void QwtMagnifier::widgetKeyReleaseEvent( QKeyEvent *keyEvent )
452{
453 Q_UNUSED( keyEvent );
454}
455
456//! \return Parent widget, where the rescaling happens
457QWidget *QwtMagnifier::parentWidget()
458{
459 if ( parent()->inherits( "QWidget" ) )
460 return ( QWidget * )parent();
461
462 return NULL;
463}
464
465//! \return Parent widget, where the rescaling happens
466const QWidget *QwtMagnifier::parentWidget() const
467{
468 if ( parent()->inherits( "QWidget" ) )
469 return ( const QWidget * )parent();
470
471 return NULL;
472}
473
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