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unity8/Components/ResponsiveGridView.qml
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1/*
2 * Copyright (C) 2013 Canonical, Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 3.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
17import QtQuick 2.0
18import Ubuntu.Components 0.1
20/*
21 Essentially a GridView where you can specify the maximum number of columns it can have.
22 */
23Item {
24 property int minimumHorizontalSpacing: units.gu(0.5)
25 // property int minimumNumberOfColumns: 2 // FIXME: not implemented
26 property int maximumNumberOfColumns: 6
27 readonly property int columns: gridView.columns
28 property alias verticalSpacing: gridView.verticalSpacing
29 readonly property alias margins: gridView.margin
30 property int delegateWidth
31 property int delegateHeight
32 property alias model: gridView.model
33 property alias delegate: gridView.delegate
34 readonly property int cellWidth: gridView.cellWidth
35 readonly property int cellHeight: gridView.cellHeight
36 readonly property int totalContentHeight: {
37 return contentHeightForRows(Math.ceil(gridView.model.count / columns))
38 }
39 property alias interactive: gridView.interactive
40 readonly property alias flicking: gridView.flicking
41 readonly property alias moving: gridView.moving
42 readonly property alias pressDelay: gridView.pressDelay
43 property alias delegateCreationBegin: gridView.delegateCreationBegin
44 property alias delegateCreationEnd: gridView.delegateCreationEnd
45 property alias highlightIndex: gridView.highlightIndex
46 readonly property alias currentItem: gridView.currentItem
48 function contentHeightForRows(rows) {
49 return rows * cellHeight + verticalSpacing
50 }
52 GridView {
53 id: gridView
54 objectName: "responsiveGridViewGrid"
55 anchors {
56 fill: parent
57 leftMargin: margin/2
58 rightMargin: margin/2
59 topMargin: verticalSpacing
60 }
61 clip: parent.height != totalContentHeight
63 function pixelToGU(value) {
64 return Math.floor(value / units.gu(1));
65 }
67 function spacingForColumns(columns) {
68 // spacing between columns as an integer number of GU, the remainder goes in the margins
69 var spacingGU = pixelToGU(allocatableHorizontalSpace / columns);
70 return units.gu(spacingGU);
71 }
73 function columnsForSpacing(spacing) {
74 // minimum margin is half of the spacing
75 return Math.max(1, Math.floor((parent.width - spacing/2) / (delegateWidth + spacing)));
76 }
78 property real allocatableHorizontalSpace: parent.width - columns * delegateWidth
79 property int columns: Math.min(columnsForSpacing(minimumHorizontalSpacing), maximumNumberOfColumns)
80 property real horizontalSpacing: spacingForColumns(columns)
81 property real verticalSpacing: horizontalSpacing
82 property int margin: allocatableHorizontalSpace - columns * horizontalSpacing
83 property int highlightIndex: -1
85 cellWidth: delegateWidth + horizontalSpacing
86 cellHeight: delegateHeight + verticalSpacing
88 onHighlightIndexChanged: {
89 if (highlightIndex != -1) {
90 currentIndex = highlightIndex
91 }
92 }
93 }