Material: Add proper elevation support

- Added an ElevationEffect component based on elevation shadows from Angular Material
- Use it on Button, ToolBar, ComboBox, Drawer, Pane, Popup, Menu, and Switch
- Add an elevation property to the Material attached object
- Update the button colors based on the elevation property

Change-Id: I5152e1a56bdcb1016cc4f945a16ef510e0cdece6
Task-number: QTBUG-51276
Reviewed-by: Nikita Krupenko <krnekit@gmail.com>
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>

1 files changed, 6 insertions, 6 deletions

diff --git a/src/imports/controls/material/Popup.qml b/src/imports/controls/material/Popup.qml
index 08bfaa19..4f1db60e 100644
--- a/src/imports/controls/material/Popup.qml
+++ b/src/imports/controls/material/Popup.qml
@@ -38,10 +38,13 @@ import QtQuick 2.6
 import QtGraphicalEffects 1.0
 import QtQuick.Templates 2.0 as T
 import QtQuick.Controls.Material 2.0
+import QtQuick.Controls.Material.impl 2.0
 
 T.Popup {
     id: control
 
+    Material.elevation: 24
+
     implicitWidth: Math.max(background ? background.implicitWidth : 0,
                             contentWidth > 0 ? contentWidth + leftPadding + rightPadding : 0)
     implicitHeight: Math.max(background ? background.implicitHeight : 0,
@@ -70,12 +73,9 @@ T.Popup {
         radius: 3
         color: control.Material.dialogColor
 
-        layer.enabled: true
-        layer.effect: DropShadow {
-            verticalOffset: 1
-            color: control.Material.dropShadowColor
-            samples: 15
-            spread: 0.5
+        layer.enabled: control.Material.elevation > 0
+        layer.effect: ElevationEffect {
+            elevation: control.Material.elevation
         }
     }
 }