Adding loading screen for rendering LaTeX formula when threaded setting is enabled.

common/src/history/common.mjs

@@ -95,11 +95,15 @@ export class Action {
         if(!Latex.enabled)
             throw new Error("Cannot render an item as LaTeX when LaTeX is disabled.")
         const imgDepth = History.imageDepth
-        const { source, width, height } = await Latex.requestAsyncRender(
+        const renderArguments = [
             latexString,
             imgDepth * (History.fontSize + 2),
             History.themeTextColor
-        )
+        ]
+        let render = Latex.findPrerendered(...renderArguments)
+        if(render === null)
+            render = await Latex.requestAsyncRender(...renderArguments)
+        const { source, width, height } = render
         return `<img src="${source}" width="${width / imgDepth}" height="${height / imgDepth}" style="vertical-align: middle"/>`
     }
 

common/src/module/canvas.mjs

@@ -25,7 +25,10 @@ import Objects from "./objects.mjs"
 import History from "./history.mjs"
 import Settings from "./settings.mjs"
 
+
 class CanvasAPI extends Module {
+    
+    
     /** @type {CanvasInterface} */
     #canvas = null
     /** @type {CanvasRenderingContext2D} */

common/src/module/latex.mjs

@@ -17,6 +17,7 @@
  */
 
 import { Module } from "./common.mjs"
+import { BaseEvent } from "../events.mjs"
 import * as Instruction from "../lib/expr-eval/instruction.mjs"
 import { escapeValue } from "../lib/expr-eval/expression.mjs"
 import { HelperInterface, LatexInterface } from "./interface.mjs"
@@ -44,6 +45,28 @@ const equivalchars = ["\\pi", "\\infty",
     "{}_{4}", "{}_{5}", "{}_{6}", "{}_{7}", "{}_{8}", "{}_{9}", "{}_{0}",
 ]
 
+
+
+
+class AsyncRenderStartedEvent extends BaseEvent {
+    constructor(markup, fontSize, color) {
+        super("async-render-started")
+        this.markup = markup
+        this.fontSize = fontSize
+        this.color = color
+    }
+}
+
+
+class AsyncRenderFinishedEvent extends BaseEvent {
+    constructor(markup, fontSize, color) {
+        super("async-render-finished")
+        this.markup = markup
+        this.fontSize = fontSize
+        this.color = color
+    }
+}
+
 /**
  * Class containing the result of a LaTeX render.
  *
@@ -60,6 +83,8 @@ class LatexRenderResult {
 }
 
 class LatexAPI extends Module {
+    static emits = ["async-render-started", "async-render-finished"]
+    
     /** @type {LatexInterface} */
     #latex = null
 
@@ -113,10 +138,14 @@ class LatexAPI extends Module {
     async requestAsyncRender(markup, fontSize, color) {
         if(!this.initialized) throw new Error("Attempting requestAsyncRender before initialize!")
         let render
-        if(this.#latex.supportsAsyncRender)
+        if(this.#latex.supportsAsyncRender) {
+            console.trace()
+            this.emit(new AsyncRenderStartedEvent(markup, fontSize, color))
             render = await this.#latex.renderAsync(markup, fontSize, color)
-        else
+            this.emit(new AsyncRenderFinishedEvent(markup, fontSize, color))
+        } else {
             render = this.#latex.renderSync(markup, fontSize, color)
+        }
         const args = render.split(",")
         return new LatexRenderResult(...args)
     }

common/src/preferences/general.mjs

@@ -47,8 +47,8 @@ class EnableLatex extends BoolSetting {
 }
 
 const ENABLE_LATEX_ASYNC = new BoolSetting(
-    qsTranslate("general", "Enable asynchronous LaTeX renderer"),
-    "enable_latex_async",
+    qsTranslate("general", "Enable threaded LaTeX renderer (experimental)"),
+    "enable_latex_threaded",
     "new"
 )
 

common/test/mock/helper.mjs

@@ -23,7 +23,7 @@ const DEFAULT_SETTINGS = {
     "reset_redo_stack": true,
     "last_install_greet": "0",
     "enable_latex": true,
-    "enable_latex_async": true,
+    "enable_latex_threaded": true,
     "expression_editor": {
         "autoclose": true,
         "colorize": true,

runtime-pyside6/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/LogarithmPlotter.qml

@@ -17,10 +17,10 @@
  */
 
 import QtQml
-import QtQuick.Controls
-import eu.ad5001.MixedMenu 1.1
-import QtQuick.Layouts 1.12
 import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts 1.12
+import eu.ad5001.MixedMenu 1.1
 
 // Auto loading all modules.
 import eu.ad5001.LogarithmPlotter.Common
@@ -158,21 +158,17 @@ ApplicationWindow {
         Overlay.ViewPositionChange {
             id: viewPositionChanger
             anchors.fill: parent
-            canvas: parent
-            settingsInstance: settings
         }
         
         Overlay.PickLocation {
             id: positionPicker
             anchors.fill: parent
-            canvas: parent
         }
+    }
         
-        // Overlay.Loading {
-        //     id: loadingOverlay
-        //     anchors.fill: parent
-        //     canvas: parent
-        // }
+    Overlay.Loading {
+        id: loadingOverlay
+        anchors.fill: parent
     }
     
     Timer {

runtime-pyside6/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/ObjectLists/ObjectLists.qml

@@ -56,7 +56,7 @@ ScrollView {
             property var editingRows: []
             model: Modules.Objects.currentObjects[objType]
             width: objectsListView.width
-            implicitHeight: contentItem.childrenRect.height
+            height: contentItem.childrenRect.height + 10
             visible: model != undefined && model.length > 0
             interactive: false
             

runtime-pyside6/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Overlay/Loading.qml

@@ -17,3 +17,114 @@
  */
 
 import QtQuick
+import QtQuick.Controls
+
+
+/*!
+    \qmltype Loading
+    \inqmlmodule eu.ad5001.LogarithmPlotter.Overlay
+    \brief Overlay notifiying the user when a file is loading.
+
+    Provides an overlay over the canvas that is shown when the user loads a new file, both to lock the ViewPositionChange
+    overlay and inform the user of what is loading and how much remains.
+    
+    \sa Common, ViewPositionChange
+*/
+Item {
+    id: loadingRoot
+    opacity: 0
+    visible: opacity !== 0
+    clip: true
+    
+    property int currentlyLoading: 0
+    property int maxCurrentLoadingSteps: 0
+    
+    Behavior on opacity { PropertyAnimation {} }
+    
+    Rectangle {
+        anchors.fill: parent
+        color: sysPalette.window
+        opacity: 0.85
+    }
+        
+    Column {
+        spacing: 5
+        anchors {
+            verticalCenter: parent.verticalCenter
+            left: parent.left
+            right: parent.right
+        }
+        
+        Text {
+            id: loadingTitle
+            anchors.horizontalCenter: parent.horizontalCenter
+            font.pixelSize: 20
+            color: sysPalette.windowText
+        }
+        
+        ProgressBar {
+            id: progress
+            anchors.horizontalCenter: parent.horizontalCenter
+            width: 300
+            from: 0
+            value: loadingRoot.maxCurrentLoadingSteps - loadingRoot.currentlyLoading
+            to: loadingRoot.maxCurrentLoadingSteps
+        }
+        
+        Text {
+            id: lastFinishedStep
+            anchors.horizontalCenter: parent.horizontalCenter
+            color: sysPalette.windowText
+        }
+    }
+    
+    MouseArea {
+        id: picker
+        anchors.fill: parent
+        hoverEnabled: parent.visible
+        cursorShape: Qt.ArrowCursor
+        acceptedButtons: Qt.LeftButton | Qt.RightButton
+    }
+    
+    
+    
+    /*!
+        \qmlmethod void Loading::addedLoadingStep()
+        Registers one new loading step that will eventually call \c finishedLoadingStep.
+    */
+    function addedLoadingStep() {
+        if(loadingRoot.maxCurrentLoadingSteps === 1) {
+            // Only when several ones need to be loaded.
+            const fileName = Modules.Settings.saveFilename.split('/').pop().split('\\').pop()
+            loadingTitle.text = qsTr("Loading...")
+            loadingRoot.opacity = 1
+        }
+        loadingRoot.currentlyLoading++
+        loadingRoot.maxCurrentLoadingSteps++
+    }
+    
+    /*!
+        \qmlmethod void Loading::finishedLoadingStep()
+        Marks a loading step as finished and displays the message to the user.
+    */
+    function finishedLoadingStep(message) {
+        loadingRoot.currentlyLoading--
+        const current = loadingRoot.maxCurrentLoadingSteps - loadingRoot.currentlyLoading
+        lastFinishedStep.text = `${message} (${current}/${loadingRoot.maxCurrentLoadingSteps})`
+        if(loadingRoot.currentlyLoading === 0) {
+            loadingRoot.maxCurrentLoadingSteps = 0
+            loadingRoot.opacity = 0
+        }
+    }
+    
+    
+    Component.onCompleted: function() {
+        Modules.Latex.on("async-render-started", (e) => {
+            addedLoadingStep()
+        })
+        Modules.Latex.on("async-render-finished", (e) => {
+            const markup = e.markup.length > 20 ? e.markup.substring(0, 15)+"..." : e.markup
+            finishedLoadingStep(qsTr("Finished rendering of %1").arg(markup))
+        })
+    }
+}

runtime-pyside6/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Overlay/ViewPositionChange.qml

@@ -57,16 +57,6 @@ Item {
     */
     signal endPositionChange(int deltaX, int deltaY)
     
-    /*!
-       \qmlproperty var ViewPositionChangeOverlay::canvas
-       LogGraphCanvas instance.
-    */
-    property var canvas
-    /*!
-       \qmlproperty var ViewPositionChangeOverlay::settingsInstance
-       Settings instance.
-    */
-    property var settingsInstance
     /*!
        \qmlproperty int ViewPositionChangeOverlay::prevX
        The x coordinate (on the mousearea) at the last change of the canvas position.

runtime-pyside6/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Overlay/qmldir

@@ -1,4 +1,5 @@
 module eu.ad5001.LogarithmPlotter.Overlay
 
+Loading 1.0 Loading.qml
 PickLocation 1.0 PickLocation.qml
 ViewPositionChange 1.0 ViewPositionChange.qml

runtime-pyside6/LogarithmPlotter/util/config.py

@@ -28,7 +28,7 @@ DEFAULT_SETTINGS = {
     "reset_redo_stack": True,
     "last_install_greet": "0",
     "enable_latex": which("latex") is not None and which("dvipng") is not None,
-    "enable_latex_async": True,
+    "enable_latex_threaded": True,
     "expression_editor": {
         "autoclose": True,
         "colorize": True,

runtime-pyside6/LogarithmPlotter/util/debug.py

@@ -22,9 +22,9 @@ from os import path
 from re import compile
 
 CURRENT_PATH = path.dirname(path.realpath(__file__))
-SOURCEMAP_PATH = path.realpath(f"{CURRENT_PATH}/../qml/eu/ad5001/LogarithmPlotter/js/index.mjs.map")
+SOURCEMAP_PATH = path.realpath(f"{CURRENT_PATH}/../qml/eu/ad5001/LogarithmPlotter/Common/index.mjs.map")
 SOURCEMAP_INDEX = None
-INDEX_REG = compile(r"build\/runtime-pyside6\/LogarithmPlotter\/qml\/eu\/ad5001\/LogarithmPlotter\/js\/index.mjs:(\d+)")
+INDEX_REG = compile(r"build\/runtime-pyside6\/LogarithmPlotter\/qml\/eu\/ad5001\/LogarithmPlotter\/Common\/index.mjs:(\d+)")
 
 
 class LOG_COLORS:

runtime-pyside6/LogarithmPlotter/util/latex.py

@@ -91,7 +91,7 @@ class Latex(QObject):
 
     @Property(bool)
     def supportsAsyncRender(self) -> bool:
-        return config.getSetting("enable_latex_async")
+        return config.getSetting("enable_latex_threaded")
 
     @Slot(result=bool)
     def checkLatexInstallation(self) -> bool: