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2021-03-05 11:26:34 -08:00
commit a10351f38d
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+/*
+* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+* its licensors.
+*
+* For complete copyright and license terms please see the LICENSE at the root of this
+* distribution (the "License"). All use of this software is governed by the License,
+* or, if provided, by the license below or the license accompanying this file. Do not
+* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*
+*/
+
+#include "QtViewPaneEffects.h"
+
+#include <AzCore/std/smart_ptr/unique_ptr.h>
+
+#include <QGraphicsEffect>
+#include <QWidget>
+#include <QVariant>
+
+namespace AzQtComponents
+{
+    static const char* s_viewPaneManagerDisableEffectPropertyName = "QtViewPaneManagerDisableEffect";
+    static const float s_disabledPaneOpacity = 0.4f;
+
+    // put the widget into a grayed out state to indicate it cannot be interacted with
+    static void DisableViewPaneDisabledGraphicsEffect(QWidget* widget)
+    {
+        // only remove effects from widgets that we added them to
+        QGraphicsEffect* effect = widget->graphicsEffect();
+        if (effect != nullptr && !effect->property(s_viewPaneManagerDisableEffectPropertyName).isNull())
+        {
+            widget->setGraphicsEffect(nullptr);
+        }
+    }
+
+    // force the widget to be repainted
+    static void ForceWidgetRedraw(QWidget* widget)
+    {
+        widget->hide();
+        widget->resize(widget->size());
+        widget->show();
+    }
+
+    // restore the widget to its normal state to show it can now be interacted with
+    static void EnableViewPaneDisabledGraphicsEffect(QWidget* widget)
+    {
+        // only apply effects to widgets that didn't have them already...
+        if (widget->graphicsEffect() == nullptr)
+        {
+            auto effect = AZStd::make_unique<QGraphicsOpacityEffect>();
+            effect->setOpacity(s_disabledPaneOpacity);
+            // flag this as our effect so we can get rid of it later
+            effect->setProperty(s_viewPaneManagerDisableEffectPropertyName, true);
+
+            widget->setGraphicsEffect(effect.release());
+
+            // ensure the widget is redrawn with the updated graphical effect
+            ForceWidgetRedraw(widget);
+        }
+    }
+
+    void SetWidgetInteractEnabled(QWidget* widget, const bool on)
+    {
+        widget->setEnabled(on);
+
+        if (on)
+        {
+            DisableViewPaneDisabledGraphicsEffect(widget);
+        }
+        else
+        {
+            EnableViewPaneDisabledGraphicsEffect(widget);
+        }
+    }
+} // namespace AzQtComponents