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unity8/qml/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 2.3
18import Ubuntu.Components 1.3
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 if (gridView.model) {
38 return contentHeightForRows(Math.ceil(gridView.model.count / columns), cellHeight)
39 } else {
40 return 0;
41 }
42 }
43 property alias interactive: gridView.interactive
44 readonly property alias flicking: gridView.flicking
45 readonly property alias moving: gridView.moving
46 readonly property alias pressDelay: gridView.pressDelay
47 readonly property alias originY: gridView.originY
48 property alias displayMarginBeginning: gridView.displayMarginBeginning
49 property alias displayMarginEnd: gridView.displayMarginEnd
50 property alias highlightIndex: gridView.highlightIndex
51 property alias cacheBuffer: gridView.cacheBuffer
52 readonly property alias currentItem: gridView.currentItem
53 property alias topMargin: gridView.topMargin
55 function contentHeightForRows(rows, height) {
56 return rows * height
57 }
59 GridView {
60 id: gridView
61 objectName: "responsiveGridViewGrid"
62 anchors {
63 fill: parent
64 leftMargin: margin/2
65 rightMargin: margin/2
66 }
67 clip: parent.height != totalContentHeight
69 function pixelToGU(value) {
70 return Math.floor(value / units.gu(1));
71 }
73 function spacingForColumns(columns) {
74 // spacing between columns as an integer number of GU, the remainder goes in the margins
75 var spacingGU = pixelToGU(allocatableHorizontalSpace / columns);
76 return units.gu(spacingGU);
77 }
79 function columnsForSpacing(spacing) {
80 // minimum margin is half of the spacing
81 return Math.max(1, Math.floor(parent.width / (delegateWidth + spacing)));
82 }
84 property real allocatableHorizontalSpace: parent.width - columns * delegateWidth
85 property int columns: Math.min(columnsForSpacing(minimumHorizontalSpacing), maximumNumberOfColumns)
86 property real horizontalSpacing: spacingForColumns(columns)
87 property real verticalSpacing: horizontalSpacing
88 property int margin: allocatableHorizontalSpace - columns * horizontalSpacing
89 property int highlightIndex: -1
91 cellWidth: delegateWidth + horizontalSpacing
92 cellHeight: delegateHeight + verticalSpacing
94 onHighlightIndexChanged: {
95 if (highlightIndex != -1) {
96 currentIndex = highlightIndex
97 }
98 }
99 }