KChart

KChartLayoutItems.h
1/*
2 * SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
3 *
4 * This file is part of the KD Chart library.
5 *
6 * SPDX-License-Identifier: GPL-2.0-or-later
7 */
8
9#ifndef KCHARTLAYOUTITEMS_H
10#define KCHARTLAYOUTITEMS_H
11
12#include <QBrush>
13#include <QFont>
14#include <QFontMetricsF>
15#include <QLayout>
16#include <QLayoutItem>
17#include <QPen>
18
19#include "KChartTextAttributes.h"
20#include "KChartMarkerAttributes.h"
21
22QT_BEGIN_NAMESPACE
23class QPainter;
24class KTextDocument;
25QT_END_NAMESPACE
26
27// TODO remove
28QRectF rotatedRect( const QRectF& pt, qreal rotation );
29
30namespace KChart {
31 class AbstractDiagram;
32 class PaintContext;
33
34 /**
35 * Base class for all layout items of KChart
36 * \internal
37 */
38 class KCHART_EXPORT AbstractLayoutItem : public QLayoutItem
39 {
40 public:
42 QLayoutItem( itemAlignment ),
43 mParent( nullptr ),
44 mParentLayout( nullptr ) {}
45
46 /**
47 * Default impl: just call paint.
48 *
49 * Derived classes like KChart::AbstractArea are providing
50 * additional action here.
51 */
52 virtual void paintAll( QPainter& painter );
53
54 virtual void paint( QPainter* ) = 0;
55
56
57 /**
58 * Default impl: Paint the complete item using its layouted position and size.
59 */
60 virtual void paintCtx( PaintContext* context );
61
62 /**
63 Inform the item about its widget: This enables the item,
64 to trigger that widget's update, whenever the size of the item's
65 contents has changed.
66
67 Thus, you need to call setParentWidget on every item, that
68 has a non-fixed size.
69 */
70 virtual void setParentWidget( QWidget* widget );
71
72 /**
73 Report changed size hint: ask the parent widget to recalculate the layout.
74 */
75 virtual void sizeHintChanged() const;
76
77 void setParentLayout( QLayout* lay )
78 {
79 mParentLayout = lay;
80 }
81 QLayout* parentLayout()
82 {
83 return mParentLayout;
84 }
85 void removeFromParentLayout()
86 {
87 if ( mParentLayout ) {
88 if ( widget() )
89 mParentLayout->removeWidget( widget() );
90 else
91 mParentLayout->removeItem( this );
92 }
93 }
94 protected:
95 QWidget* mParent;
96 QLayout* mParentLayout;
97 };
98
99 /**
100 * Layout item showing a text
101 *\internal
102 */
103 class KCHART_EXPORT TextLayoutItem : public AbstractLayoutItem
104 {
105 public:
107 TextLayoutItem( const QString& text,
108 const TextAttributes& attributes,
109 const QObject* autoReferenceArea,
110 KChartEnums::MeasureOrientation autoReferenceOrientation,
111 Qt::Alignment alignment = Qt::Alignment() );
112
113 void setAutoReferenceArea( const QObject* area );
114 const QObject* autoReferenceArea() const;
115
116 void setText(const QString & text);
117 QString text() const;
118
119 void setTextAlignment( Qt::Alignment );
120 Qt::Alignment textAlignment() const;
121
122 /**
123 \brief Use this to specify the text attributes to be used for this item.
124
125 \sa textAttributes
126 */
127 void setTextAttributes( const TextAttributes& a );
128
129 /**
130 Returns the text attributes to be used for this item.
131
132 \sa setTextAttributes
133 */
134 TextAttributes textAttributes() const;
135
136 /** pure virtual in QLayoutItem */
137 bool isEmpty() const override;
138 /** pure virtual in QLayoutItem */
139 Qt::Orientations expandingDirections() const override;
140 /** pure virtual in QLayoutItem */
141 QSize maximumSize() const override;
142 /** pure virtual in QLayoutItem */
143 QSize minimumSize() const override;
144 /** pure virtual in QLayoutItem */
145 QSize sizeHint() const override;
146 /** pure virtual in QLayoutItem */
147 void setGeometry( const QRect& r ) override;
148 /** pure virtual in QLayoutItem */
149 QRect geometry() const override;
150
151 virtual int marginWidth() const;
152
153 virtual QSize sizeHintUnrotated() const;
154
155 virtual bool intersects( const TextLayoutItem& other, const QPointF& myPos, const QPointF& otherPos ) const;
156 virtual bool intersects( const TextLayoutItem& other, const QPoint& myPos, const QPoint& otherPos ) const;
157
158 virtual qreal realFontSize() const;
159 virtual QFont realFont() const;
160
161 void paint( QPainter* ) override;
162
163 QPolygon boundingPolygon() const;
164 private:
165 bool maybeUpdateRealFont() const;
166 QSize unrotatedSizeHint( const QFont& fnt = QFont() ) const;
167 QSize unrotatedTextSize( QFont fnt = QFont() ) const;
168 QSize calcSizeHint( const QFont& font ) const;
169 int marginWidth( const QSize& textSize ) const;
170
171 qreal fitFontSizeToGeometry() const;
172
173 QRect mRect;
174 QString mText;
175 Qt::Alignment mTextAlignment;
176 TextAttributes mAttributes;
177 const QObject* mAutoReferenceArea;
178 KChartEnums::MeasureOrientation mAutoReferenceOrientation;
179 mutable QSize cachedSizeHint;
180 mutable QPolygon mCachedBoundingPolygon;
181 mutable qreal cachedFontSize;
182 mutable QFont cachedFont;
183 };
184
185 class KCHART_EXPORT TextBubbleLayoutItem : public AbstractLayoutItem
186 {
187 public:
188 TextBubbleLayoutItem();
189 TextBubbleLayoutItem( const QString& text,
190 const TextAttributes& attributes,
191 const QObject* autoReferenceArea,
192 KChartEnums::MeasureOrientation autoReferenceOrientation,
193 Qt::Alignment alignment = Qt::Alignment() );
194
195 ~TextBubbleLayoutItem() override;
196
197 void setAutoReferenceArea( const QObject* area );
198 const QObject* autoReferenceArea() const;
199
200 void setText(const QString & text);
201 QString text() const;
202
203 void setTextAttributes( const TextAttributes& a );
204 TextAttributes textAttributes() const;
205
206 /** pure virtual in QLayoutItem */
207 bool isEmpty() const override;
208 /** pure virtual in QLayoutItem */
209 Qt::Orientations expandingDirections() const override;
210 /** pure virtual in QLayoutItem */
211 QSize maximumSize() const override;
212 /** pure virtual in QLayoutItem */
213 QSize minimumSize() const override;
214 /** pure virtual in QLayoutItem */
215 QSize sizeHint() const override;
216 /** pure virtual in QLayoutItem */
217 void setGeometry( const QRect& r ) override;
218 /** pure virtual in QLayoutItem */
219 QRect geometry() const override;
220
221 void paint( QPainter* painter ) override;
222
223 protected:
224 int borderWidth() const;
225
226 private:
227 TextLayoutItem* const m_text;
228 };
229
230 /**
231 * Layout item showing a data point marker
232 * \internal
233 */
234 class KCHART_EXPORT MarkerLayoutItem : public AbstractLayoutItem
235 {
236 public:
238 const MarkerAttributes& marker,
239 const QBrush& brush,
240 const QPen& pen,
241 Qt::Alignment alignment = Qt::Alignment() );
242
243 Qt::Orientations expandingDirections() const override;
244 QRect geometry() const override;
245 bool isEmpty() const override;
246 QSize maximumSize() const override;
247 QSize minimumSize() const override;
248 void setGeometry( const QRect& r ) override;
249 QSize sizeHint() const override;
250
251 void paint( QPainter* ) override;
252
253 static void paintIntoRect(
254 QPainter* painter,
255 const QRect& rect,
256 AbstractDiagram* diagram,
257 const MarkerAttributes& marker,
258 const QBrush& brush,
259 const QPen& pen );
260
261 private:
262 AbstractDiagram* mDiagram;
263 QRect mRect;
264 MarkerAttributes mMarker;
265 QBrush mBrush;
266 QPen mPen;
267 };
268
269 /**
270 * Layout item showing a coloured line
271 * \internal
272 */
273 class KCHART_EXPORT LineLayoutItem : public AbstractLayoutItem
274 {
275 public:
277 int length,
278 const QPen& pen,
279 Qt::Alignment mLegendLineSymbolAlignment,
280 Qt::Alignment alignment = Qt::Alignment() );
281
282 Qt::Orientations expandingDirections() const override;
283 QRect geometry() const override;
284 bool isEmpty() const override;
285 QSize maximumSize() const override;
286 QSize minimumSize() const override;
287 void setGeometry( const QRect& r ) override;
288 QSize sizeHint() const override;
289
290 void setLegendLineSymbolAlignment(Qt::Alignment legendLineSymbolAlignment);
291 virtual Qt::Alignment legendLineSymbolAlignment() const;
292
293 void paint( QPainter* ) override;
294
295 static void paintIntoRect(
296 QPainter* painter,
297 const QRect& rect,
298 const QPen& pen,
299 Qt::Alignment lineAlignment);
300
301 private:
302 AbstractDiagram* mDiagram; //TODO: not used. remove it
303 int mLength;
304 QPen mPen;
305 QRect mRect;
306 Qt::Alignment mLegendLineSymbolAlignment;
307 };
308
309 /**
310 * Layout item showing a coloured line and a data point marker
311 * \internal
312 */
313 class KCHART_EXPORT LineWithMarkerLayoutItem : public AbstractLayoutItem
314 {
315 public:
317 int lineLength,
318 const QPen& linePen,
319 int markerOffs,
320 const MarkerAttributes& marker,
321 const QBrush& markerBrush,
322 const QPen& markerPen,
323 Qt::Alignment alignment = Qt::Alignment() );
324
325 Qt::Orientations expandingDirections() const override;
326 QRect geometry() const override;
327 bool isEmpty() const override;
328 QSize maximumSize() const override;
329 QSize minimumSize() const override;
330 void setGeometry( const QRect& r ) override;
331 QSize sizeHint() const override;
332
333 void paint( QPainter* ) override;
334
335 private:
336 AbstractDiagram* mDiagram;
337 QRect mRect;
338 int mLineLength;
339 QPen mLinePen;
340 int mMarkerOffs;
341 MarkerAttributes mMarker;
342 QBrush mMarkerBrush;
343 QPen mMarkerPen;
344 };
345
346
347 /**
348 * Layout item showing a horizontal line
349 * \internal
350 */
351 class KCHART_EXPORT HorizontalLineLayoutItem : public AbstractLayoutItem
352 {
353 public:
355
356 Qt::Orientations expandingDirections() const override;
357 QRect geometry() const override;
358 bool isEmpty() const override;
359 QSize maximumSize() const override;
360 QSize minimumSize() const override;
361 void setGeometry( const QRect& r ) override;
362 QSize sizeHint() const override;
363
364 void paint( QPainter* ) override;
365
366 private:
367 QRect mRect;
368 };
369
370 /**
371 * Layout item showing a vertical line
372 * \internal
373 */
374 class KCHART_EXPORT VerticalLineLayoutItem : public AbstractLayoutItem
375 {
376 public:
378
379 Qt::Orientations expandingDirections() const override;
380 QRect geometry() const override;
381 bool isEmpty() const override;
382 QSize maximumSize() const override;
383 QSize minimumSize() const override;
384 void setGeometry( const QRect& r ) override;
385 QSize sizeHint() const override;
386
387 void paint( QPainter* ) override;
388
389 private:
390 QRect mRect;
391 };
392
393 /**
394 * @brief An empty layout item
395 * \internal
396 *
397 * The AutoSpacerLayoutItem is automatically put into each corner cell of
398 * the planeLayout grid: one of its reference-layouts is a QVBoxLayout (for
399 * the top, or bottom axes resp.), the other one is a QHBoxLayout (for the
400 * left/right sided axes).
401 *
402 * The spacer reserves enough space so all of the AbstractAreas contained
403 * in the two reference-layouts can display not only their in-bounds
404 * content but also their overlapping content reaching out of their area.
405 *
406 * KChart's layouting is applying this schema:
407\verbatim
408 +------------------+-------------------------+-----------------+
409 | +--------------+ | +---------------------+ | +-------------+ |
410 | | | | | QVBoxLayout for | | | | |
411 | | AUTO | | | the top axis/axes | | | AUTO | |
412 | | SPACER | | +---------------------+ | | SPACER | |
413 | | ITEM | | | | | | ITEM | |
414 | | | | | | | | | |
415 | +--------------+ | +---------------------+ | +-------------+ |
416 +------------------+-------------------------+-----------------+
417 | +--------+-----+ | +---------------------+ | +-------+-----+ |
418 | | | | | | | | | | | |
419 | | | | | | | | | | | |
420 | | QHBox- | | | | | | | Right | | |
421 | | Layout | | | | | | | | | |
422 | | | | | | | | | axes | | |
423 | | for | | | | | | | | | |
424 | | | | | | | | | layout| | |
425 | | the | | | | DIAGRAM(s) | | | | | |
426 | | | | | | | | | | | |
427 | | left | | | | | | | | | |
428 | | | | | | | | | | | |
429 | | axis | | | | | | | | | |
430 | | or | | | | | | | | | |
431 | | axes | | | | | | | | | |
432 | | | | | | | | | | | |
433 | +--------+-----+ | +---------------------+ | +-------+-----+ |
434 +------------------+-------------------------+-----------------+
435 | +--------------+ | +---------------------+ | +-------------+ |
436 | | | | | QVBoxLayout for | | | | |
437 | | AUTO | | | the bottom axes | | | AUTO | |
438 | | SPACER | | +---------------------+ | | SPACER | |
439 | | ITEM | | | | | | ITEM | |
440 | | | | | | | | | |
441 | +--------------+ | +---------------------+ | +-------------+ |
442 +------------------+-------------------------+-----------------+
443\endverbatim
444 *
445 * A typical use case is an Abscissa axis with long labels:
446\verbatim
447 2 -|
448 |
449 1 -|
450 |
451 0 -+------------------------------------
452 | | | | |
453 Monday Tuesday Wednesday Thursday Friday
454\endverbatim
455 * The last letters of the word "Friday" would have been
456 * cut off in previous versions of KChart - that is
457 * if you did not call KChart::Chart::setGlobalLeading().
458 *
459 * Now the word will be shown completely because there
460 * is an auto-spacer-item taking care for the additional
461 * space needed in the lower/right corner.
462 */
463 class KCHART_EXPORT AutoSpacerLayoutItem : public AbstractLayoutItem
464 {
465 public:
467 bool layoutIsAtTopPosition, QHBoxLayout *rightLeftLayout,
468 bool layoutIsAtLeftPosition, QVBoxLayout *topBottomLayout );
469
470 Qt::Orientations expandingDirections() const override;
471 QRect geometry() const override;
472 bool isEmpty() const override;
473 QSize maximumSize() const override;
474 QSize minimumSize() const override;
475 void setGeometry( const QRect& r ) override;
476 QSize sizeHint() const override;
477
478 void paint( QPainter* ) override;
479
480 private:
481 QRect mRect;
482 bool mLayoutIsAtTopPosition;
483 QHBoxLayout *mRightLeftLayout;
484 bool mLayoutIsAtLeftPosition;
485 QVBoxLayout *mTopBottomLayout;
486
487 mutable QBrush mCommonBrush;
488 mutable QSize mCachedSize;
489 };
490
491}
492
493#endif /* KCHARTLAYOUTITEMS_H */
MeasureOrientation
Measure orientation mode: the way how the absolute value of a KChart::Measure is determined during KC...
AbstractDiagram defines the interface for diagram classes.
Base class for all layout items of KChart.
Layout item showing a horizontal line.
Layout item showing a coloured line.
Layout item showing a coloured line and a data point marker.
A set of attributes controlling the appearance of data set markers.
Layout item showing a data point marker.
Stores information about painting diagrams.
A set of text attributes.
Layout item showing a text.
Layout item showing a vertical line.
KTextDocument is an internally used enhanced QTextDocument.
void removeWidget(QWidget *widget)
typedef Alignment
typedef Orientations
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