Asset Browser Search View Column Resizing (#4087)

* Added resizing

Signed-off-by: igarri <igarri@amazon.com>

* Added Signals and Slots for resizing columns

Signed-off-by: igarri <igarri@amazon.com>

* Cleaned up code

Signed-off-by: igarri <igarri@amazon.com>

* Fixed Column Resize when docking

Signed-off-by: igarri <igarri@amazon.com>

* Added constants

Signed-off-by: igarri <igarri@amazon.com>

* Applied Code review feedback

Signed-off-by: igarri <igarri@amazon.com>

* aplied more feedback

Signed-off-by: igarri <igarri@amazon.com>

* Addressed Code Review Comments

Signed-off-by: igarri <igarri@amazon.com>

* Fixing bad merge

Signed-off-by: igarri <igarri@amazon.com>

* Added fix in initialization

Signed-off-by: igarri <igarri@amazon.com>

* Changed header setup sequence

Signed-off-by: igarri <igarri@amazon.com>

Code/Editor/AzAssetBrowser/AzAssetBrowserWindow.cpp

@@ -141,6 +141,10 @@ AzAssetBrowserWindow::AzAssetBrowserWindow(QWidget* parent)
         m_ui->m_assetBrowserTreeViewWidget, &AzAssetBrowser::AssetBrowserTreeView::ClearTypeFilter, m_ui->m_searchWidget,
         &AzAssetBrowser::SearchWidget::ClearTypeFilter);
 
+    connect(
+        this, &AzAssetBrowserWindow::SizeChangedSignal, m_ui->m_assetBrowserTableViewWidget,
+        &AzAssetBrowser::AssetBrowserTableView::UpdateSizeSlot);
+
     m_ui->m_assetBrowserTreeViewWidget->SetName("AssetBrowserTreeView_main");
 }
 
@@ -164,6 +168,25 @@ QObject* AzAssetBrowserWindow::createListenerForShowAssetEditorEvent(QObject* pa
     return listener;
 }
 
+void AzAssetBrowserWindow::resizeEvent(QResizeEvent* resizeEvent)
+{
+    // leftLayout is the parent of the tableView
+    // rightLayout is the parent of the preview window.
+    // Workaround: When docking windows this event keeps holding the old size of the widgets instead of the new one
+    // but the resizeEvent holds the new size of the whole widget
+    // So we have to save the proportions somehow
+    const QWidget* leftLayout = m_ui->m_leftLayout;
+    const QVBoxLayout* rightLayout = m_ui->m_rightLayout;
+
+    const float oldLeftLayoutWidth = aznumeric_cast<float>(leftLayout->geometry().width());
+    const float oldWidth = aznumeric_cast<float>(leftLayout->geometry().width() + rightLayout->geometry().width());
+
+    const float newWidth = oldLeftLayoutWidth * aznumeric_cast<float>(resizeEvent->size().width()) / oldWidth;
+    
+    emit SizeChangedSignal(aznumeric_cast<int>(newWidth));
+    QWidget::resizeEvent(resizeEvent);
+}
+
 void AzAssetBrowserWindow::OnInitViewToggleButton()
 {
     CreateSwitchViewMenu();

Code/Editor/AzAssetBrowser/AzAssetBrowserWindow.h

@@ -53,9 +53,17 @@ public:
 
     static QObject* createListenerForShowAssetEditorEvent(QObject* parent);
 
+
+Q_SIGNALS:
+    void SizeChangedSignal(int newWidth);
+
+protected:
+    void resizeEvent(QResizeEvent* resizeEvent) override;
+
 private:
     void OnInitViewToggleButton();
     void UpdateDisplayInfo();
+
 protected slots:
     void CreateSwitchViewMenu();
     void SetExpandedAssetBrowserMode();