QmlDesigner: Fix downloading textures no longer working after some clicks

A "locking" mechanism was implemented to prevent multiple textures from
being downloaded at the same time. However, there was a mistake made,
which made it so that when a texture that had already been downloaded
was clicked again, this locking would be enforced and not released.

Also, fixed minor issues:
* The download button now has a black outline, so as to better
distinguish it inside black-and-white textures
* Canceling the download of a texture no longer marks the download as
failed -- it should show it as if the download was never attempted.
* Fixed tooltips not showing the texture size for downloaded textures
- and now we also update the tooltip text after the real texture has been
downloaded.
* Always creating the "target path" in the FileExtractor, if it does not
exist -- this is different from the "target folder" name, which is an
folder that can optionally be created inside this "target path"

(cherry picked from commit 87f76d9bfa)
Task-number: QDS-8664
Change-Id: Ieac0e81a5595a8bff3d1aa7ff6252e16c2509c2e
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Samuel Ghinet <samuel.ghinet@qt.io>

share/qtcreator/qmldesigner/contentLibraryQmlSource/ContentLibraryTexture.qml

@@ -121,6 +121,8 @@ Item {
 
             anchors.right: parent.right
             anchors.bottom: parent.bottom
+            style: Text.Outline
+            styleColor: "black"
 
             visible: root.downloadState !== "downloaded"
         }
@@ -164,10 +166,10 @@ Item {
         }
 
         onClicked: {
-            if (!rootView.markTextureDownloading())
+            if (root.downloadState !== "" && root.downloadState !== "failed")
                 return
 
-            if (root.downloadState !== "" && root.downloadState !== "failed")
+            if (!rootView.markTextureDownloading())
                 return
 
             progressBar.visible = true
@@ -205,7 +207,7 @@ Item {
             root.progressText = ""
             root.progressValue = 0
 
-            root.downloadState = "failed"
+            root.downloadState = ""
             root.downloadStateChanged()
             mouseArea.enabled = true
 

src/plugins/qmldesigner/components/contentlibrary/contentlibrarytexture.cpp

@@ -20,20 +20,8 @@ ContentLibraryTexture::ContentLibraryTexture(QObject *parent, const QFileInfo &i
     , m_baseName{iconFileInfo.baseName()}
     , m_icon(icon)
 {
-    m_fileExt = computeFileExt();
+    m_fileExt = resolveFileExt();
-
+    m_toolTip = resolveToolTipText();
-    QString fileName;
-    QString imageInfo;
-    if (m_fileExt.isEmpty()) {
-        imageInfo = ImageUtils::imageInfo(m_iconPath, false);
-        fileName = m_baseName + m_defaultExt;
-    } else {
-        fileName = m_baseName + m_fileExt;
-        QString fullDownloadPath = m_downloadPath + "/" + fileName;
-        imageInfo = ImageUtils::imageInfo(fullDownloadPath, false);
-    }
-
-    m_toolTip = QLatin1String("%1\n%2").arg(fileName, imageInfo);
 }
 
 bool ContentLibraryTexture::filter(const QString &searchText)
@@ -56,7 +44,7 @@ QString ContentLibraryTexture::path() const
     return m_iconPath;
 }
 
-QString ContentLibraryTexture::computeFileExt()
+QString ContentLibraryTexture::resolveFileExt()
 {
     const QFileInfoList files = QDir(m_downloadPath).entryInfoList(QDir::Files);
     const QFileInfoList textureFiles = Utils::filtered(files, [this](const QFileInfo &fi) {
@@ -76,6 +64,23 @@ QString ContentLibraryTexture::computeFileExt()
     return QString{"."} + textureFiles.at(0).completeSuffix();
 }
 
+QString ContentLibraryTexture::resolveToolTipText()
+{
+    QString fileName;
+    QString imageInfo;
+
+    if (m_fileExt.isEmpty()) {
+        imageInfo = ImageUtils::imageInfo(m_iconPath, false);
+        fileName = m_baseName + m_defaultExt;
+    } else {
+        fileName = m_baseName + m_fileExt;
+        QString fullDownloadPath = m_downloadPath + "/" + fileName;
+        imageInfo = ImageUtils::imageInfo(fullDownloadPath, true);
+    }
+
+    return QLatin1String("%1\n%2").arg(fileName, imageInfo);
+}
+
 bool ContentLibraryTexture::isDownloaded() const
 {
     if (m_fileExt.isEmpty())
@@ -87,7 +92,13 @@ bool ContentLibraryTexture::isDownloaded() const
 
 void ContentLibraryTexture::setDownloaded()
 {
-    m_fileExt = computeFileExt();
+    m_fileExt = resolveFileExt();
+    QString toolTip = resolveToolTipText();
+
+    if (toolTip != m_toolTip) {
+        m_toolTip = toolTip;
+        emit textureToolTipChanged();
+    }
 }
 
 QString ContentLibraryTexture::parentDirPath() const

src/plugins/qmldesigner/components/contentlibrary/contentlibrarytexture.h

@@ -15,7 +15,7 @@ class ContentLibraryTexture : public QObject
 
     Q_PROPERTY(QString textureIconPath MEMBER m_iconPath CONSTANT)
     Q_PROPERTY(QString textureParentPath READ parentDirPath CONSTANT)
-    Q_PROPERTY(QString textureToolTip MEMBER m_toolTip CONSTANT)
+    Q_PROPERTY(QString textureToolTip MEMBER m_toolTip NOTIFY textureToolTipChanged)
     Q_PROPERTY(QUrl textureIcon MEMBER m_icon CONSTANT)
     Q_PROPERTY(bool textureVisible MEMBER m_visible NOTIFY textureVisibleChanged)
     Q_PROPERTY(QString textureWebUrl MEMBER m_webUrl CONSTANT)
@@ -35,10 +35,12 @@ public:
 
 signals:
     void textureVisibleChanged();
+    void textureToolTipChanged();
 
 private:
     inline static const QString m_defaultExt = ".png";
-    QString computeFileExt();
+    QString resolveFileExt();
+    QString resolveToolTipText();
 
     QString m_iconPath;
     QString m_downloadPath;

src/plugins/qmldesigner/utils/fileextractor.cpp

@@ -82,6 +82,14 @@ QString FileExtractor::targetPath() const
 void FileExtractor::setTargetPath(const QString &path)
 {
     m_targetPath = Utils::FilePath::fromString(path);
+
+    QDir dir(m_targetPath.toString());
+
+    if (!path.isEmpty() && !dir.exists()) {
+        // Even though m_targetPath will be created eventually, we need to make sure the path exists
+        // before m_bytesBefore is being calculated.
+        dir.mkpath(m_targetPath.toString());
+    }
 }
 
 void FileExtractor::browse()