1 /*
2 * Copyright (c) 1999-2000, Eric Moon.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions, and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions, and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
27 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31
32 // MouseTrackingHelpers.cpp
33 // e.moon 8mar99
34
35 #include "MouseTrackingHelpers.h"
36
37 __USE_CORTEX_NAMESPACE
38
39
MouseTrackingSourceView(BRect frame,const char * name,uint32 resizeMode,uint32 flags,uint32 trackingFlags)40 MouseTrackingSourceView::MouseTrackingSourceView(BRect frame, const char* name,
41 uint32 resizeMode, uint32 flags, uint32 trackingFlags)
42 : BView(frame, name, resizeMode, flags),
43 m_pDest(0),
44 m_trackingFlags(trackingFlags),
45 m_bTracking(false)
46 {
47 //FrameResized(frame.Width(), frame.Height());
48 }
49
50
~MouseTrackingSourceView()51 MouseTrackingSourceView::~MouseTrackingSourceView()
52 {
53 }
54
55
56 // get mouse-down point in screen coordinates; returns
57 // B_OK on success, or B_ERROR if no longer tracking
58 // the mouse.
getTrackingOrigin(BPoint * poPoint) const59 status_t MouseTrackingSourceView::getTrackingOrigin(
60 BPoint* poPoint) const {
61 if(!m_bTracking)
62 return B_ERROR;
63 *poPoint = m_initPoint;
64 return B_OK;
65 }
66
67 // fetch/set the destination handler
68
setTrackingDestination(IMouseTrackingDestination * pDest)69 status_t MouseTrackingSourceView::setTrackingDestination(
70 IMouseTrackingDestination* pDest) {
71 if(m_bTracking)
72 return B_ERROR;
73
74 m_pDest = pDest;
75 return B_OK;
76 }
77
78 // ---------------------------------------------------------------- //
79 // BView impl.
80 // ---------------------------------------------------------------- //
81
82 // handle mouse events
MouseDown(BPoint point)83 void MouseTrackingSourceView::MouseDown(BPoint point) {
84 if(!m_trackingFlags)
85 return;
86
87 // get mouse state & initial point
88 uint32 buttons;
89 GetMouse(&point, &buttons);
90 m_prevPoint = ConvertToScreen(point);
91 m_initPoint = m_prevPoint;
92
93 // start tracking the mouse
94 SetMouseEventMask(B_POINTER_EVENTS,
95 B_LOCK_WINDOW_FOCUS|B_NO_POINTER_HISTORY);
96 m_bTracking = true;
97
98 // notify destination
99 if(m_pDest)
100 m_pDest->mouseTrackingBegin(this, buttons, point);
101 }
102
MouseMoved(BPoint point,uint32 transit,const BMessage * pMsg)103 void MouseTrackingSourceView::MouseMoved(BPoint point, uint32 transit,
104 const BMessage* pMsg) {
105
106 if(m_bTracking) {
107
108 // mouse-tracking update: figure number of pixels moved
109 // (along the axes I care about)
110 uint32 buttons;
111 GetMouse(&point, &buttons, false);
112 ConvertToScreen(&point);
113
114 if(point == m_prevPoint) // no motion?
115 return;
116
117 float xDelta = m_trackingFlags & TRACK_HORIZONTAL ?
118 point.x - m_prevPoint.x : 0.0;
119 float yDelta = m_trackingFlags & TRACK_VERTICAL ?
120 point.y - m_prevPoint.y : 0.0;
121
122 // pass info to destination view
123 if(m_pDest)
124 m_pDest->mouseTrackingUpdate(buttons, xDelta, yDelta, point);
125
126 // store point for future delta calculations
127 m_prevPoint = point;
128 }
129 }
130
MouseUp(BPoint point)131 void MouseTrackingSourceView::MouseUp(BPoint point) {
132 if(m_bTracking) {
133 // PRINT(( "MouseTrackingSourceView::MouseUp()\n"));
134
135 // +++++ handle final update
136
137 // clean up
138 m_bTracking = false;
139 if(m_pDest)
140 m_pDest->mouseTrackingEnd();
141 }
142 }
143
144 // look for a default destination
AttachedToWindow()145 void MouseTrackingSourceView::AttachedToWindow() {
146 if(m_pDest) // already have a destination
147 return;
148
149 for(BView* pParent = Parent(); pParent; pParent = pParent->Parent()) {
150 IMouseTrackingDestination* pFound =
151 dynamic_cast<IMouseTrackingDestination*>(pParent);
152 if(pFound) // found a valid destination
153 m_pDest = pFound;
154 }
155 }
156
157 /*
158 // track current frame rectangle
159 void MouseTrackingSourceView::FrameResized(float width, float height) {
160 _inherited::FrameResized(width, height);
161 m_prevFrame = Frame();
162
163 // +++++ adjust if currently tracking?
164 }
165 */
166
167 // END -- MouseTrackingHelpers.cpp --
168
169