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39 
40 #ifndef QWIDGETRESIZEHANDLER_P_H
41 #define QWIDGETRESIZEHANDLER_P_H
42 
43 //
44 //  W A R N I N G
45 //  -------------
46 //
47 // This file is not part of the Qt API.  This header file may
48 // change from version to version without notice, or even be
49 // removed.
50 //
51 // We mean it.
52 //
53 
54 #include <QtWidgets/private/qtwidgetsglobal_p.h>
55 #include "QtCore/qobject.h"
56 #include "QtCore/qpoint.h"
57 
58 QT_REQUIRE_CONFIG(resizehandler);
59 
60 QT_BEGIN_NAMESPACE
61 
62 class QMouseEvent;
63 class QKeyEvent;
64 
65 class Q_WIDGETS_EXPORT QWidgetResizeHandler : public QObject
66 {
67     Q_OBJECT
68 
69 public:
70     enum Action {
71         Move        = 0x01,
72         Resize        = 0x02,
73         Any        = Move|Resize
74     };
75 
76     explicit QWidgetResizeHandler(QWidget *parent, QWidget *cw = nullptr);
setActive(bool b)77     void setActive(bool b) { setActive(Any, b); }
78     void setActive(Action ac, bool b);
isActive()79     bool isActive() const { return isActive(Any); }
80     bool isActive(Action ac) const;
setMovingEnabled(bool b)81     void setMovingEnabled(bool b) { movingEnabled = b; }
isMovingEnabled()82     bool isMovingEnabled() const { return movingEnabled; }
83 
isButtonDown()84     bool isButtonDown() const { return buttonDown; }
85 
setExtraHeight(int h)86     void setExtraHeight(int h) { extrahei = h; }
setSizeProtection(bool b)87     void setSizeProtection(bool b) { sizeprotect = b; }
88 
setFrameWidth(int w)89     void setFrameWidth(int w) { fw = w; }
90 
91     void doResize();
92     void doMove();
93 
94 Q_SIGNALS:
95     void activate();
96 
97 protected:
98     bool eventFilter(QObject *o, QEvent *e) override;
99     void mouseMoveEvent(QMouseEvent *e);
100     void keyPressEvent(QKeyEvent *e);
101 
102 private:
103     Q_DISABLE_COPY_MOVE(QWidgetResizeHandler)
104 
105     enum MousePosition {
106         Nowhere,
107         TopLeft, BottomRight, BottomLeft, TopRight,
108         Top, Bottom, Left, Right,
109         Center
110     };
111 
112     QWidget *widget;
113     QWidget *childWidget;
114     QPoint moveOffset;
115     QPoint invertedMoveOffset;
116     MousePosition mode;
117     int fw;
118     int extrahei;
119     int range;
120     uint buttonDown            :1;
121     uint moveResizeMode            :1;
122     uint activeForResize    :1;
123     uint sizeprotect            :1;
124     uint movingEnabled                    :1;
125     uint activeForMove            :1;
126 
127     void setMouseCursor(MousePosition m);
isMove()128     bool isMove() const {
129         return moveResizeMode && mode == Center;
130     }
isResize()131     bool isResize() const {
132         return moveResizeMode && !isMove();
133     }
134 };
135 
136 QT_END_NAMESPACE
137 
138 #endif // QWIDGETRESIZEHANDLER_P_H
139