1.問題
在QML的ListView控件,再填充資料之後,我們有時候還需要對model中的資料進行更改。可是,對model資料進行修改之後,ListView的資料并沒有及時重新整理出來。甚至有時候forceLayout()也沒有作用。
2.解決辦法
我們可以擷取ListView對象的委托item,通過修改item的屬性及時達到重新整理的目的。
例如QML如下:
ListView {
id: layer_list;
objectName: "layer_list";
anchors.fill: parent;
clip: true;
interactive: false;
model: modelSource;
spacing: 2;
delegate: delegateSource;
}
Component {
id: delegateSource;
Rectangle {
id: wrapper;
objectName: "delegateSourceItem";
property string guid: layer_list.model.get(index, 0)
property string can_layer_see: layer_list.model.get(index, 4);
Image {
id: img_see;
anchors.right: img_lock.left;
anchors.rightMargin: 7;
anchors.verticalCenter: parent.verticalCenter;
width: 12;
height: 12;
fillMode: Image.PreserveAspectFit;
source: can_layer_see == "true" ? "images/can_see.png" : "images/not_see.png";
}
}
}
當我們修改img_see的資料時,可以通過一下代碼進行修改:
// 動态更新可見性
QQuickItem* content = mpLayerList->property("contentItem").value<QQuickItem*>();
QList<QQuickItem*> list = content->childItems();
for (QQuickItem* item : list) {
std::string on = item->objectName().toStdString();
if (strcmp(on.c_str(), "delegateSourceItem") == 0) {
std::string tempguid = item->property("guid").toString().toStdString();
if (strcmp(tempguid.c_str(), guid.c_str()) == 0) {
item->setProperty("can_layer_see", see.c_str());
LOG(DEBUG) << "Update Signal Source Visibility,GUID: " << guid << ", See:" << see;
}
}
}