Real-time Sorting and Filtering of a GridView

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This wiki entry is created in response to a few forum threads (relevant link at bottom) asking for this method. Feel free to contribute to this article with explanations or code.

Real-time Sorting and Filtering of a GridView

I first generate a list of elements of various colours and shapes. After this, I create two text boxes for each variable (shape, colour).

In the latter section of code that deals with the GridView, I create a filter function which sifts through the elements in the model. I have hooked this function on to the onTextChanged event to create a real-time effect.

Having found an item that doesn't match, it gets sent to the end of the list. If the item is matched, it is restored to its original index. The item will automatically fade away when it isn't matched as the opacity property illustrates.

main.qml

import QtQuick 1.0

Rectangle {
 property alias shapeFilter: inputTextShape.text
 property alias colorFilter: inputTextcolor.text
 width: 480; height: 480
 ListModel {
 id: widgetModel
 ListElement { index: 0; hue: "green"; shape: "circle" }
 ListElement { index: 1; hue: "purple"; shape: "circle" }
 ListElement { index: 2; hue: "blue"; shape: "rectangle" }
 ListElement { index: 3; hue: "purple"; shape: "rectangle" }
 ListElement { index: 4; hue: "blue"; shape: "circle" }
 ListElement { index: 5; hue: "green"; shape: "rectangle" }
 ListElement { index: 6; hue: "green"; shape: "circle" }
 }
 Component {
 id: widgetDelegate
 Rectangle {
 width: 80; height: 80
 smooth: true
 color: hue
 radius: shape  "circle" ? 80 : 0
            opacity: (shapeFilter != "" ? shapeFilter  shape : true) &&
 (colorFilter != "" ? colorFilter == hue : true)

Behavior on opacity { NumberAnimation { duration: 500 } }
 }
 }
 GridView {
 width: parent.width; height: parent.height * 0.9
 anchors.top: parent.top
 model: widgetModel
 delegate: widgetDelegate
 MouseArea {
 id: selectCircleFromShape
 anchors.fill: parent
 }
 }
 Item {
 id: textArea
 height: 60; width: parent.width/2
 anchors.bottom: parent.bottom
 anchors.bottomMargin: 20
 Text {
 width: 50; height: parent.height/2; anchors.leftMargin: 20
 text: "Shape:"; font.pixelSize: 24
 }
 Text {
 width: 50; height: parent.height/2; anchors.leftMargin: 20
 anchors.bottom: parent.bottom
 text: "Color:"; font.pixelSize: 24
 }
 function filter(type, comp) {
 if (shapeFilter  "" && colorFilter  "")
 {
 for (var i = 0; i < widgetModel.count; i+'')
 widgetModel.move(i,widgetModel.get(i).index,1)
 }
 else
 {
 for (var j = 0, i = 0; j < widgetModel.count; j, i''+)
 if ((type ? widgetModel.get(i).hue : widgetModel.get(i).shape) != comp)
 widgetModel.move(i,widgetModel.count - 1,1)
 }
 }
 Rectangle {
 anchors.right: parent.right
 width: 100; height: parent.height / 2
 border.color: "steelblue"
 border.width: 5; radius: 10
 TextInput {
 id: inputTextShape; focus: true
 anchors.fill: parent; anchors.leftMargin: 10
 font.pixelSize: 24
 onTextChanged: textArea.filter(false, shapeFilter)
 }
 }
 Rectangle {
 anchors.right: parent.right
 anchors.bottom: parent.bottom
 width: 100; height: parent.height / 2
 border.color: "steelblue"
 border.width: 5; radius: 10
 TextInput {
 id: inputTextcolor
 anchors.fill: parent; anchors.leftMargin: 10
 font.pixelSize: 24
 onTextChanged: textArea.filter(true, colorFilter)
 }
 }
 }
}