Qt QML ListView visible - qt

Question

I've found the following code in a QML example. I have a question about sections: is there a way to hide all the elements belonging to a section when the user clicks on the section header? For example, is it possible to hide "Ant" and "Flea" when the user clicks the "Tiny" header?
Here is the code:
Rectangle {
id: container
width: 300
height: 360
ListModel {
id: animalsModel
ListElement { name: "Ant"; size: "Tiny" }
ListElement { name: "Flea"; size: "Tiny" }
ListElement { name: "Parrot"; size: "Small" }
ListElement { name: "Guinea pig"; size: "Small" }
ListElement { name: "Rat"; size: "Small" }
ListElement { name: "Butterfly"; size: "Small" }
ListElement { name: "Dog"; size: "Medium" }
ListElement { name: "Cat"; size: "Medium" }
ListElement { name: "Pony"; size: "Medium" }
ListElement { name: "Koala"; size: "Medium" }
ListElement { name: "Horse"; size: "Large" }
ListElement { name: "Tiger"; size: "Large" }
ListElement { name: "Giraffe"; size: "Large" }
ListElement { name: "Elephant"; size: "Huge" }
ListElement { name: "Whale"; size: "Huge" }
}
// The delegate for each section header
Component {
id: sectionHeading
Rectangle {
id: sectionHeadingRectangle
width: container.width
height: childrenRect.height
color: "lightsteelblue"
Text {
text: section
font.bold: true
font.pixelSize: 20;
}
}
}
Component {
id: section
Rectangle {
width: container.width
height: mainText.height
Text { id: mainText; text: name; font.pixelSize: 18 }
}
}
ListView {
id: view
anchors.fill: parent
// width: parent.width
model: animalsModel
delegate: section
section.property: "size"
section.criteria: ViewSection.FullString
section.delegate: sectionHeading
}
}

Answer 1

It is possible to do this by sending a custom signal when a section is clicked and having all delegates connect to this signal and check if the section clicked correspond to theirs, and hide accordingly :
Rectangle {
id: container
width: 300
height: 360
ListModel {
id: animalsModel
ListElement { name: "Ant"; size: "Tiny" }
ListElement { name: "Flea"; size: "Tiny" }
ListElement { name: "Parrot"; size: "Small" }
ListElement { name: "Guinea pig"; size: "Small" }
ListElement { name: "Rat"; size: "Small" }
ListElement { name: "Butterfly"; size: "Small" }
ListElement { name: "Dog"; size: "Medium" }
ListElement { name: "Cat"; size: "Medium" }
ListElement { name: "Pony"; size: "Medium" }
ListElement { name: "Koala"; size: "Medium" }
ListElement { name: "Horse"; size: "Large" }
ListElement { name: "Tiger"; size: "Large" }
ListElement { name: "Giraffe"; size: "Large" }
ListElement { name: "Elephant"; size: "Huge" }
ListElement { name: "Whale"; size: "Huge" }
}
// The delegate for each section header
Component {
id: sectionHeading
Rectangle {
id: sectionHeadingRectangle
width: container.width
height: childrenRect.height
color: "lightsteelblue"
Text {
text: section
font.bold: true
font.pixelSize: 20;
}
MouseArea {
anchors.fill: parent
onClicked: view.sectionClicked(section)
}
}
}
Component {
id: section
Rectangle {
id: rect
width: container.width
height: shown ? mainText.height : 0
visible: shown
property bool shown: true
Text { id: mainText; text: name; font.pixelSize: 18 }
Connections {
target: rect.ListView.view
onSectionClicked: if (rect.ListView.section === name) shown = !shown;
}
}
}
ListView {
id: view
anchors.fill: parent
// width: parent.width
signal sectionClicked(string name)
model: animalsModel
delegate: section
section.property: "size"
section.criteria: ViewSection.FullString
section.delegate: sectionHeading
}
}