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39
40#ifndef QTREEVIEW_P_H
41#define QTREEVIEW_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtWidgets/private/qtwidgetsglobal_p.h>
55#include "private/qabstractitemview_p.h"
56#if QT_CONFIG(animation)
57#include <QtCore/qvariantanimation.h>
58#endif
59#include <QtCore/qabstractitemmodel.h>
60#include <QtCore/qvector.h>
61
62QT_REQUIRE_CONFIG(treeview);
63
64QT_BEGIN_NAMESPACE
65
66struct QTreeViewItem
67{
68 QTreeViewItem() : parentItem(-1), expanded(false), spanning(false), hasChildren(false),
69 hasMoreSiblings(false), total(0), level(0), height(0) {}
70 QModelIndex index; // we remove items whenever the indexes are invalidated
71 int parentItem; // parent item index in viewItems
72 uint expanded : 1;
73 uint spanning : 1;
74 uint hasChildren : 1; // if the item has visible children (even if collapsed)
75 uint hasMoreSiblings : 1;
76 uint total : 28; // total number of children visible
77 uint level : 16; // indentation
78 int height : 16; // row height
79};
80
81Q_DECLARE_TYPEINFO(QTreeViewItem, Q_MOVABLE_TYPE);
82
83class Q_WIDGETS_EXPORT QTreeViewPrivate : public QAbstractItemViewPrivate
84{
85 Q_DECLARE_PUBLIC(QTreeView)
86public:
87
88 QTreeViewPrivate()
89 : QAbstractItemViewPrivate(),
90 header(nullptr), indent(20), lastViewedItem(0), defaultItemHeight(-1),
91 uniformRowHeights(false), rootDecoration(true),
92 itemsExpandable(true), sortingEnabled(false),
93 expandsOnDoubleClick(true),
94 allColumnsShowFocus(false), customIndent(false), current(0), spanning(false),
95 animationsEnabled(false), columnResizeTimerID(0),
96 autoExpandDelay(-1), hoverBranch(-1), geometryRecursionBlock(false), hasRemovedItems(false),
97 treePosition(0) {}
98
99 ~QTreeViewPrivate() {}
100 void initialize();
101 int logicalIndexForTree() const;
102 inline bool isTreePosition(int logicalIndex) const
103 {
104 return logicalIndex == logicalIndexForTree();
105 }
106
107 QItemViewPaintPairs draggablePaintPairs(const QModelIndexList &indexes, QRect *r) const override;
108 void adjustViewOptionsForIndex(QStyleOptionViewItem *option, const QModelIndex &current) const override;
109
110#if QT_CONFIG(animation)
111 struct AnimatedOperation : public QVariantAnimation
112 {
113 int item;
114 QPixmap before;
115 QPixmap after;
116 QWidget *viewport;
117 AnimatedOperation() : item(0) { setEasingCurve(QEasingCurve::InOutQuad); }
118 int top() const { return startValue().toInt(); }
119 QRect rect() const { QRect rect = viewport->rect(); rect.moveTop(pos: top()); return rect; }
120 void updateCurrentValue(const QVariant &) override { viewport->update(rect()); }
121 void updateState(State state, State) override { if (state == Stopped) before = after = QPixmap(); }
122 } animatedOperation;
123 void prepareAnimatedOperation(int item, QVariantAnimation::Direction d);
124 void beginAnimatedOperation();
125 void drawAnimatedOperation(QPainter *painter) const;
126 QPixmap renderTreeToPixmapForAnimation(const QRect &rect) const;
127 void _q_endAnimatedOperation();
128#endif // animation
129
130 void expand(int item, bool emitSignal);
131 void collapse(int item, bool emitSignal);
132
133 void _q_columnsAboutToBeRemoved(const QModelIndex &, int, int) override;
134 void _q_columnsRemoved(const QModelIndex &, int, int) override;
135 void _q_modelAboutToBeReset();
136 void _q_sortIndicatorChanged(int column, Qt::SortOrder order);
137 void _q_modelDestroyed() override;
138
139 void layout(int item, bool recusiveExpanding = false, bool afterIsUninitialized = false);
140
141 int pageUp(int item) const;
142 int pageDown(int item) const;
143 int itemForKeyHome() const;
144 int itemForKeyEnd() const;
145
146 int itemHeight(int item) const;
147 int indentationForItem(int item) const;
148 int coordinateForItem(int item) const;
149 int itemAtCoordinate(int coordinate) const;
150
151 int viewIndex(const QModelIndex &index) const;
152 QModelIndex modelIndex(int i, int column = 0) const;
153
154 void insertViewItems(int pos, int count, const QTreeViewItem &viewItem);
155 void removeViewItems(int pos, int count);
156#if 0
157 bool checkViewItems() const;
158#endif
159
160 int firstVisibleItem(int *offset = nullptr) const;
161 int lastVisibleItem(int firstVisual = -1, int offset = -1) const;
162 int columnAt(int x) const;
163 bool hasVisibleChildren( const QModelIndex& parent) const;
164
165 bool expandOrCollapseItemAtPos(const QPoint &pos);
166
167 void updateScrollBars();
168
169 int itemDecorationAt(const QPoint &pos) const;
170 QRect itemDecorationRect(const QModelIndex &index) const;
171
172
173 QVector<QPair<int, int> > columnRanges(const QModelIndex &topIndex, const QModelIndex &bottomIndex) const;
174 void select(const QModelIndex &start, const QModelIndex &stop, QItemSelectionModel::SelectionFlags command);
175
176 QPair<int,int> startAndEndColumns(const QRect &rect) const;
177
178 void updateChildCount(const int parentItem, const int delta);
179
180 void paintAlternatingRowColors(QPainter *painter, QStyleOptionViewItem *option, int y, int bottom) const;
181
182 // logicalIndices: vector of currently visibly logical indices
183 // itemPositions: vector of view item positions (beginning/middle/end/onlyone)
184 void calcLogicalIndices(QVector<int> *logicalIndices, QVector<QStyleOptionViewItem::ViewItemPosition> *itemPositions, int left, int right) const;
185 int widthHintForIndex(const QModelIndex &index, int hint, const QStyleOptionViewItem &option, int i) const;
186 QHeaderView *header;
187 int indent;
188
189 mutable QVector<QTreeViewItem> viewItems;
190 mutable int lastViewedItem;
191 int defaultItemHeight; // this is just a number; contentsHeight() / numItems
192 bool uniformRowHeights; // used when all rows have the same height
193 bool rootDecoration;
194 bool itemsExpandable;
195 bool sortingEnabled;
196 bool expandsOnDoubleClick;
197 bool allColumnsShowFocus;
198 bool customIndent;
199
200 // used for drawing
201 mutable QPair<int,int> leftAndRight;
202 mutable int current;
203 mutable bool spanning;
204
205 // used when expanding and collapsing items
206 QSet<QPersistentModelIndex> expandedIndexes;
207 bool animationsEnabled;
208
209 inline bool storeExpanded(const QPersistentModelIndex &idx) {
210 if (expandedIndexes.contains(value: idx))
211 return false;
212 expandedIndexes.insert(value: idx);
213 return true;
214 }
215
216 inline bool isIndexExpanded(const QModelIndex &idx) const {
217 //We first check if the idx is a QPersistentModelIndex, because creating QPersistentModelIndex is slow
218 return !(idx.flags() & Qt::ItemNeverHasChildren) && isPersistent(index: idx) && expandedIndexes.contains(value: idx);
219 }
220
221 // used when hiding and showing items
222 QSet<QPersistentModelIndex> hiddenIndexes;
223
224 inline bool isRowHidden(const QModelIndex &idx) const {
225 if (hiddenIndexes.isEmpty())
226 return false;
227 //We first check if the idx is a QPersistentModelIndex, because creating QPersistentModelIndex is slow
228 return isPersistent(index: idx) && hiddenIndexes.contains(value: idx);
229 }
230
231 inline bool isItemHiddenOrDisabled(int i) const {
232 if (i < 0 || i >= viewItems.count())
233 return false;
234 const QModelIndex index = viewItems.at(i).index;
235 return isRowHidden(idx: index) || !isIndexEnabled(index);
236 }
237
238 inline int above(int item) const
239 { int i = item; while (isItemHiddenOrDisabled(i: --item)){} return item < 0 ? i : item; }
240 inline int below(int item) const
241 { int i = item; while (isItemHiddenOrDisabled(i: ++item)){} return item >= viewItems.count() ? i : item; }
242 inline void invalidateHeightCache(int item) const
243 { viewItems[item].height = 0; }
244
245 inline int accessibleTable2Index(const QModelIndex &index) const {
246 return (viewIndex(index) + (header ? 1 : 0)) * model->columnCount()+index.column();
247 }
248
249 int accessibleTree2Index(const QModelIndex &index) const;
250
251 void updateIndentationFromStyle();
252
253 // used for spanning rows
254 QSet<QPersistentModelIndex> spanningIndexes;
255
256 // used for updating resized columns
257 int columnResizeTimerID;
258 QList<int> columnsToUpdate;
259
260 // used for the automatic opening of nodes during DND
261 int autoExpandDelay;
262 QBasicTimer openTimer;
263
264 // used for drawing hilighted expand/collapse indicators
265 mutable int hoverBranch;
266
267 // used for blocking recursion when calling setViewportMargins from updateGeometries
268 bool geometryRecursionBlock;
269
270 // If we should clean the set
271 bool hasRemovedItems;
272
273 // tree position
274 int treePosition;
275};
276
277QT_END_NAMESPACE
278
279#endif // QTREEVIEW_P_H
280

source code of qtbase/src/widgets/itemviews/qtreeview_p.h