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authorzautrix <zautrix>2004-06-26 19:01:18 (UTC)
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1/****************************************************************************
2** $Id$
3**
4** Implementation of QGridView class
5**
6** Created: 010523
7**
8** Copyright (C) 1992-2001 Trolltech AS. All rights reserved.
9**
10** This file is part of the widgets module of the Qt GUI Toolkit.
11**
12** This file may be distributed under the terms of the Q Public License
13** as defined by Trolltech AS of Norway and appearing in the file
14** LICENSE.QPL included in the packaging of this file.
15**
16** This file may be distributed and/or modified under the terms of the
17** GNU General Public License version 2 as published by the Free Software
18** Foundation and appearing in the file LICENSE.GPL included in the
19** packaging of this file.
20**
21** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
22** licenses may use this file in accordance with the Qt Commercial License
23** Agreement provided with the Software.
24**
25** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
26** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
27**
28** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
29** information about Qt Commercial License Agreements.
30** See http://www.trolltech.com/qpl/ for QPL licensing information.
31** See http://www.trolltech.com/gpl/ for GPL licensing information.
32**
33** Contact info@trolltech.com if any conditions of this licensing are
34** not clear to you.
35**
36**********************************************************************/
37
38
39#include "qgridview.h"
40
41#ifndef QT_NO_GRIDVIEW
42
43#include "qpainter.h"
44
45/*!
46 \class QGridView qgridview.h
47 \brief The QGridView class provides an abstract base for fixed-size
48 grids.
49
50 \ingroup abstractwidgets
51
52 A grid view consists of a number of abstract cells organized in rows
53 and columns. The cells have a fixed size and are identified with a
54 row index and a column index. The top-left cell is in row 0, column
55 0. The bottom-right cell is in row numRows()-1, column numCols()-1.
56
57 You can define \l numRows, \l numCols, \l cellWidth and
58 \l cellHeight. Reimplement the pure virtual function paintCell() to
59 draw the content of a cell.
60
61 With ensureCellVisible(), you can ensure a certain cell is
62 visible. With rowAt() and columnAt() you can find a cell based on
63 the given x- and y-coordinates.
64
65 If you need to monitor changes to the grid's dimensions (i.e. when
66 numRows or numCols is changed), reimplement the dimensionChange()
67 change handler.
68
69 Note: the row, column indices are always given in the order, row
70 (vertical offset) then column (horizontal offset). This order is the
71 opposite of all pixel operations, which are given in the order x
72 (horizontal offset), y (vertical offset).
73
74 QGridView is a very simple abstract class based on QScrollView. It
75 is designed to simplify the task of drawing many cells of the same
76 size in a potentially scrollable canvas. If you need rows and
77 columns in different sizes, use a QTable instead. If you need a
78 simple list of items, use a QListBox. If you need to present
79 hierachical data use a QListView, and if you need random objects at
80 random positions, consider using either a QIconView or a QCanvas.
81
82*/
83
84
85/*!
86 Constructs a grid view.
87
88 The \a parent, \a name and widget flag, \a f, arguments are passed to the
89 QScrollView constructor.
90*/
91QGridView::QGridView( QWidget *parent, const char *name, WFlags f )
92 :QScrollView( parent, name ,f ),nrows(5),ncols(5),cellw(12),cellh(12)
93{
94 viewport()->setBackgroundMode( PaletteBase );
95 setBackgroundMode( PaletteBackground );
96 viewport()->setFocusProxy( this );
97}
98
99/*!
100 Destroys the grid view.
101*/
102QGridView::~QGridView()
103{
104}
105
106void QGridView::updateGrid()
107{
108 resizeContents( ncols * cellw, nrows * cellh );
109}
110
111/*! \property QGridView::numRows
112 \brief The number of rows in the grid
113
114 \sa numCols
115*/
116void QGridView::setNumRows( int numRows )
117{
118 int oldnrows = nrows;
119 nrows = numRows;
120 dimensionChange( oldnrows, ncols );
121 updateGrid();
122}
123
124/*! \property QGridView::numCols
125 \brief The number of columns in the grid
126
127 \sa numRows
128*/
129void QGridView::setNumCols( int numCols )
130{
131 int oldncols = ncols;
132 ncols = numCols;
133 dimensionChange( nrows, oldncols );
134 updateGrid();
135}
136
137/*! \property QGridView::cellWidth
138 \brief The width of a grid column
139
140 All columns in a grid view have the same width.
141
142 \sa cellHeight
143*/
144void QGridView::setCellWidth( int cellWidth )
145{
146 cellw = cellWidth;
147 updateGrid();
148 updateContents( contentsX(), contentsY(), visibleWidth(), visibleHeight() );
149}
150
151/*! \property QGridView::cellHeight
152 \brief The height of a grid row
153
154 All rows in a grid view have the same height.
155
156 \sa cellWidth
157*/
158void QGridView::setCellHeight( int cellHeight )
159{
160 cellh = cellHeight;
161 updateGrid();
162 updateContents( contentsX(), contentsY(), visibleWidth(), visibleHeight() );
163}
164
165/*!
166 Returns the geometry of cell (\a row, \a column) in the content
167 coordinate system.
168
169 \sa cellRect()
170 */
171QRect QGridView::cellGeometry( int row, int column )
172{
173 QRect r;
174 if ( row >= 0 && row < nrows && column >= 0 && column < ncols )
175 r.setRect( cellw * column, cellh * row, cellw, cellh );
176 return r;
177}
178
179/*! Repaints cell (\a row, \a column).
180
181 If \a erase is TRUE, Qt erases the area of the cell before the
182 paintCell() call; otherwise no erasing takes place.
183
184 \sa QWidget::repaint()
185 */
186void QGridView::repaintCell( int row, int column, bool erase )
187{
188 QScrollView::repaintContents( cellGeometry( row, column ), erase );
189}
190
191/*! Updates cell (\a row, \a column).
192
193 \sa QWidget::update()
194 */
195void QGridView::updateCell( int row, int column )
196{
197 updateContents( cellGeometry( row, column ) );
198}
199
200/*!
201 Ensure cell (\a row, \a column) is visible, scrolling the grid view
202 if necessary.
203 */
204void QGridView::ensureCellVisible( int row, int column )
205{
206 QRect r = cellGeometry( row, column );
207 ensureVisible( r.x(), r.y(), r.width(), r.height() );
208}
209
210/*! This function fills the \a cw pixels wide and \a ch pixels high
211 rectangle starting at position (\a cx, \a cy) with the
212 background color using the painter \a p.
213
214 paintEmptyArea() is invoked by drawContents() to erase
215 or fill unused areas.
216*/
217
218void QGridView::paintEmptyArea( QPainter *p, int cx ,int cy, int cw, int ch)
219{
220 if ( gridSize().width() >= contentsWidth() && gridSize().height() >= contentsHeight() )
221 return;
222 // Region of the rect we should draw
223 contentsToViewport( cx, cy, cx, cy );
224 QRegion reg( QRect( cx, cy, cw, ch ) );
225 // Subtract the table from it
226 reg = reg.subtract( QRect( contentsToViewport( QPoint( 0, 0 ) ), gridSize() ) );
227
228 // And draw the rectangles (transformed as needed)
229 QArray<QRect> r = reg.rects();
230 QBrush brush = colorGroup().brush( QColorGroup::Background );
231 for ( int i = 0; i < (int)r.count(); ++i)
232 p->fillRect( r[ i ], brush );
233}
234
235/*!\reimp
236 */
237void QGridView::drawContents( QPainter *p, int cx, int cy, int cw, int ch )
238{
239 int colfirst = columnAt( cx );
240 int collast = columnAt( cx + cw );
241 int rowfirst = rowAt( cy );
242 int rowlast = rowAt( cy + ch );
243
244 if ( rowfirst == -1 || colfirst == -1 ) {
245 paintEmptyArea( p, cx, cy, cw, ch );
246 return;
247 }
248
249 if ( collast < 0 || collast >= ncols )
250 collast = ncols-1;
251 if ( rowlast < 0 || rowlast >= nrows )
252 rowlast = nrows-1;
253
254 // Go through the rows
255 for ( int r = rowfirst; r <= rowlast; ++r ) {
256 // get row position and height
257 int rowp = r * cellh;
258
259 // Go through the columns in the row r
260 // if we know from where to where, go through [colfirst, collast],
261 // else go through all of them
262 for ( int c = colfirst; c <= collast; ++c ) {
263 // get position and width of column c
264 int colp = c * cellw;
265 // Translate painter and draw the cell
266 p->translate( colp, rowp );
267 paintCell( p, r, c );
268 p->translate( -colp, -rowp );
269 }
270 }
271
272 // Paint empty rects
273 paintEmptyArea( p, cx, cy, cw, ch );
274}
275
276/*!
277 \reimp
278
279 (Implemented to get rid of a compiler warning.)
280*/
281void QGridView::drawContents( QPainter * )
282{
283}
284
285/*! \fn void QGridView::dimensionChange( int oldNumRows, int oldNumCols )
286
287 This change handler is called whenever any of the grid's dimensions
288 changes. \a oldNumRows and \a oldNumCols contain the old dimensions,
289 numRows() and numCols() contain the new dimensions.
290 */
291void QGridView::dimensionChange( int, int ) {}
292
293
294
295/*! \fn int QGridView::rowAt( int y ) const
296
297 Returns the number of the row at position \a y. \a y must be given in
298 content coordinates.
299
300 \sa columnAt()
301 */
302
303/*! \fn int QGridView::columnAt( int x ) const
304
305 Returns the number of the column at position \a x. \a x must be
306 given in content coordinates.
307
308 \sa rowAt()
309 */
310
311/*!
312 \fn void QGridView::paintCell( QPainter *p, int row, int col )
313
314 This pure virtual function is called to paint the single cell at
315 (\a row, \a col) using painter \a p. The painter must be open when
316 paintCell() is called and must remain open.
317
318 The coordinate system is \link QPainter::translate() translated \endlink
319 so that the origin is at the top-left corner of the cell to be
320 painted, i.e. \e cell coordinates. Do not scale or shear the coordinate
321 system (or if you do, restore the transformation matrix before you
322 return).
323
324 The painter is not clipped by default in order to get maximum
325 efficiency. If you want clipping, use
326
327 \code
328 p->setClipRect( cellRect(), QPainter::CoordPainter );
329 //... your drawing code
330 p->setClipping( FALSE );
331
332 \endcode
333
334*/
335
336/*! \fn QRect QGridView::cellRect() const
337
338 Returns the geometry of a cell in a cell's coordinate system. This
339 is a convenience function useful in paintCell(). It is equivalent to
340 QRect( 0, 0, cellWidth(), cellHeight() ).
341
342 \sa cellGeometry()
343
344 */
345
346/*!\fn QSize QGridView::gridSize() const
347
348 Returns the size of the grid in pixels.
349
350 */
351
352/*!
353 \overload
354 Repaints the contents. If \a erase is TRUE the
355 background is cleared using the background color.
356*/
357void QGridView::repaintContents( bool erase )
358{
359 QScrollView::repaintContents( contentsX(), contentsY(), visibleWidth(), visibleHeight(), erase );
360}
361
362#endif // QT_NO_GRIDVIEW