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annotate layout_view.cpp @ 9:0d7875c26974

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layout designer: hints on widget placement during drag and drop
author Goffi <goffi@goffi.org>
date Fri, 26 Aug 2011 12:15:21 +0200
parents c63d67895cbe
children 877a005c2b42
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1 /*
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2 Bellaciao: a Salut à Toi frontend
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3 Copyright (C) 2011 Jérôme Poisson (goffi@goffi.org)
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU Affero General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU Affero General Public License for more details.
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14
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15 You should have received a copy of the GNU Affero General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18 #include "layout_view.h"
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19 #include <QDebug>
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20
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21 WidgetView::WidgetView(const QString& name)
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22 : QLabel(name)
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23 {
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24 }
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25
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26 LayoutView::LayoutView(QWidget* parent)
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27 {
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28 setAcceptDrops(true);
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29 m_layout = new QVBoxLayout;
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30 setLayout(m_layout);
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31 m_layout->addStretch();
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32 setStyleSheet("QLabel {border: 1px solid black; \
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33 border-radius: 5px; \
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34 text-align: center; \
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35 background-color: white; \
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36 min-height: 20px; \
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37 max-height: 20px; \
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38 margin: 2px; \
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39 }");
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40 }
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41
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42 LayoutView::~LayoutView()
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43 {
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44 }
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45
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46 void LayoutView::setLayoutWidgets(const QHash<QString, LayoutWidget*>& layout_widgets)
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47 {
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48 m_layout_widgets = layout_widgets;
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49 }
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50
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51 void LayoutView::dragEnterEvent (QDragEnterEvent* event )
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52 {
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53 if (event->mimeData()->hasFormat(LAYOUT_WIDGET_MIME))
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54 event->acceptProposedAction();
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55 }
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56
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57 void LayoutView::dragLeaveEvent (QDragLeaveEvent* event )
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58 {
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59 m_loc_hint.setCoords(1,1,0,0); //We make the QRect invalid to hide it
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60 update();
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61 }
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62
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63
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64 void LayoutView::dragMoveEvent (QDragMoveEvent* event )
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65 {
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66 int pos_y = event->pos().y();
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67 int top = 0;
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68 QList<QWidget*> _children = findChildren<QWidget*>("");
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69
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70 QWidget* wid = 0;
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71
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72 for (m_insert_pos=0; m_insert_pos<layout()->count()-1; m_insert_pos++) {
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73 wid = layout()->itemAt(m_insert_pos)->widget();
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74
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75 if (wid->geometry().bottom() > pos_y && wid->geometry().top() < pos_y) {
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76 //We are inside a widget, we break here
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77 top = wid->geometry().bottom();
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78 m_insert_pos++;
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79 break;
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80 }
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81 else if (wid->geometry().top() > pos_y)
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82 break;
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83
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84 top = wid->geometry().bottom();
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85 }
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86
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87 m_loc_hint.setRect(5, top+1, qMax(5,width()-10), 5);
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88 update();
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89 }
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90
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91 void LayoutView::dropEvent (QDropEvent* event)
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92 {
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93 m_loc_hint.setCoords(1,1,0,0); //We make the QRect invalid to hide it
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94 update();
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95 const QMimeData *data = event->mimeData();
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96 QByteArray encodedData = data->data(LAYOUT_WIDGET_MIME);
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97 QDataStream stream(&encodedData, QIODevice::ReadOnly);
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98 while (!stream.atEnd()) {
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99 QString widget_name;
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100 stream >> widget_name;
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101 addWidget(widget_name);
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102 }
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103 }
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104
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105 void LayoutView::addWidget(const QString& name)
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106 {
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107 LayoutWidget* _widget = m_layout_widgets[name];
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108 WidgetView* _widget_view = new WidgetView(name);
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109 _widget_view->setAlignment(Qt::AlignCenter);
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110 m_layout->insertWidget(m_insert_pos, _widget_view, 0, Qt::AlignTop);
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111
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112 }
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113
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114 void LayoutView::paintEvent(QPaintEvent* event)
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115 {
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116 if (m_loc_hint.isValid()) {
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117 QPainter newPainter(this);
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118 newPainter.fillRect(m_loc_hint, Qt::blue);
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119 }
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120 }