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viewmanager: allow creating more than 1 instance of a view

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Previously, managed views were always stored in a dictionary using non-unique keys. This commit adds a method to the ViewManager component allowing for automatic unique key generation if the base key (QML component path) is the same. This is used for dialogs because we need to possibly open nested modal dialogs.

Gitlab: #1367
Change-Id: I94e0ef0e0ae79689445be0409dd902dc74554e43
This commit is contained in:
Andreas Traczyk 2023-09-26 15:06:29 -04:00
parent b963a0bdf2
commit 100756b02d
2 changed files with 46 additions and 12 deletions
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2
src/app/ViewCoordinator.qml
View file

@ -74,7 +74,7 @@ QtObject {
// Create, present, and return a dialog object.
function presentDialog(parent, path, props = {}) {
// Open the dialog once the object is created
return viewManager.createView(path, parent, function (obj) {
return viewManager.createUniqueView(path, parent, function (obj) {
const doneCb = function () {
viewManager.destroyView(path);
};

56
src/app/ViewManager.qml
View file

@ -36,36 +36,70 @@ QtObject {
}
}
// Create a view from a path only if it doesn't already exist. This is used
// by the view coordinator to create views that are not self-destructing
// (main views) and only exist once per instance of the app.
function createView(path, parent = null, cb = null, props = {}) {
if (views.hasOwnProperty(path)) {
// an instance of <path> already exists
const component = Qt.createComponent(Qt.resolvedUrl(path));
return createViewFromComponent(component, path, parent, cb, props);
}
// Create a new view. Useful when we want to create multiple views that are
// self-destructing (dialogs).
function createUniqueView(path, parent = null, cb = null, props = {}) {
const component = Qt.createComponent(Qt.resolvedUrl(path));
return createViewFromComponent(component, getViewName(path), parent, cb,
props);
}
// Create a new view from a component. If a view with the same path already
// exists, it is returned instead.
function createViewFromComponent(component, viewName, parent = null,
cb = null, props = {}) {
if (views.hasOwnProperty(viewName)) {
// an instance of the view already exists
if (cb !== null) {
cb(views[path])
cb(views[viewName])
}
return views[path]
return views[viewName]
}
const component = Qt.createComponent(Qt.resolvedUrl(path))
if (component.status === Component.Ready) {
const obj = component.createObject(parent, props)
if (obj === null) {
print("error creating object")
console.error("error creating object")
return null
}
views[path] = obj
views[viewName] = obj
// Set the view name to the object name if it has one.
const viewName = obj.objectName.toString() !== '' ? obj.objectName : path.replace(/^.*[\\\/]/, '').replace(/\.[^/.]+$/, "")
viewPaths[viewName] = path
const friendlyName = obj.objectName.toString() !== '' ?
obj.objectName :
viewName.replace(/^.*[\\\/]/, '').replace(/\.[^/.]+$/, "")
viewPaths[friendlyName] = viewName
if (cb !== null) {
cb(obj)
}
return views[path]
return views[viewName]
}
print("error creating component", path)
console.error("error creating component", component.url)
console.error(component.errorString())
Qt.exit(1)
return null
}
// Finds a unique view name for a given path by appending a number to the
// base name. For example, if a view named "MyView" already exists, the next
// view will be named "MyView_1".
function getViewName(path) {
const baseName = path.replace(/^.*[\\\/]/, '').replace(/\.[^/.]+$/, "")
let viewName = baseName
let suffix = 1
while (views.hasOwnProperty(viewName)) {
viewName = `${baseName}_${suffix}`
suffix++
}
return viewName
}
function destroyView(path) {
// The view may already have been destroyed.
if (!views.hasOwnProperty(path)) {