Add individual zoom controls

custom-example/custom.qrc

@@ -45,4 +45,8 @@
         <file alias="Custom/Widgets/CustomVehicleButton.qml">res/Custom/Widgets/CustomVehicleButton.qml</file>
         <file alias="Custom/Widgets/qmldir">res/Custom/Widgets/qmldir</file>
     </qresource>
+    <qresource prefix="Custom/Camera">
+        <file alias="Custom/Camera/qmldir">res/Custom/Camera/qmldir</file>
+        <file alias="Custom/Camera/ZoomControl.qml">res/Custom/Camera/ZoomControl.qml</file>
+    </qresource>
 </RCC>

custom-example/deploy/qgroundcontrol-start.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+HERE="$(dirname "$(readlink -f "${0}")")"
+export LD_LIBRARY_PATH="${HERE}/usr/lib/x86_64-linux-gnu":"${HERE}/Qt/libs":$LD_LIBRARY_PATH
+export QML2_IMPORT_PATH="${HERE}/Qt/qml"
+export QT_PLUGIN_PATH="${HERE}/Qt/plugins"
+
+# hack until icon issue with AppImage is resolved
+mkdir -p ~/.icons && \cp -f ${HERE}/qgroundcontrol.png ~/.icons
+
+"${HERE}/CustomQGC" "$@"

custom-example/res/Custom/Camera/ZoomControl.qml

@@ -0,0 +1,213 @@
+import QtQuick 2.0
+import QtQuick.Controls 2.4
+import QtGraphicalEffects 1.0
+
+
+Item {
+    id: _root
+
+    property color mainColor: "#000000"
+    property color contentColor: "#FFFFFF"
+    property alias fontPointSize: zoomStatusTextItem.font.pointSize
+    property real  zoomLevel: NaN
+    property alias zoomLevelVisible: zoomStatusItem.visible
+    property bool  showZoomPrecision: true
+
+    signal zoomIn()
+    signal zoomOut()
+    signal continuousZoomStart(var zoomIn)
+    signal continuousZoomStop()
+
+    height: zoomStatusTextItem.height * 2
+    width: (zoomLevelVisible ? (zoomStatusItem.width - zoomInButton.width/2) : 0) + zoomInButton.width + zoomOutButton.width
+
+    Rectangle {
+        id: zoomStatusItem
+
+        color: mainColor
+        opacity: 0.5
+        radius: height/2
+
+        anchors.left: _root.left
+        anchors.verticalCenter: _root.verticalCenter
+
+        width: height * 2
+        height: _root.height * 0.8
+    }
+
+    Item {
+        visible: zoomStatusItem.visible
+
+        anchors.left: zoomStatusItem.left
+        anchors.top: zoomStatusItem.top
+        anchors.right: zoomStatusItem.horizontalCenter
+        anchors.bottom: zoomStatusItem.bottom
+
+        z: zoomStatusItem.z + 1
+
+        Text {
+            id: zoomStatusTextItem
+
+            anchors.centerIn: parent
+            opacity: 2
+
+            color: _root.contentColor
+
+            text: isNaN(zoomLevel) ? "-" : "x" + _root.zoomLevel.toFixed(_root.showZoomPrecision ? 1 : 0)
+        }
+    }
+
+    Button {
+        id: zoomInButton
+        flat: true
+
+        anchors.left: zoomLevelVisible ? zoomStatusItem.horizontalCenter : _root.left
+        anchors.top: _root.top
+        width: height
+        height: _root.height
+
+        property bool holding: false
+
+        onPressed: {
+            _root.zoomIn()
+        }
+
+        onPressAndHold: {
+            holding = true
+        }
+
+        onReleased: {
+            holding = false
+        }
+
+        background: Rectangle {
+            anchors.fill: zoomInButton
+            radius: zoomInButton.width/2
+
+            color: _root.mainColor
+        }
+
+        contentItem: Item {
+            anchors.fill: zoomInButton
+            Rectangle {
+                id: zoomInMinusRectangle
+                anchors.centerIn: parent
+
+                width: zoomInButton.width * 0.4
+                height: zoomInButton.height * 0.05
+
+                color: _root.contentColor
+            }
+            Rectangle {
+                anchors.centerIn: parent
+
+                width: zoomInMinusRectangle.height
+                height: zoomInMinusRectangle.width
+
+                color: _root.contentColor
+            }
+        }
+    }
+
+    Item {
+        id: buttonSeparator
+
+        anchors.left: zoomInButton.right
+        anchors.verticalCenter: zoomInButton.verticalCenter
+        width: zoomInButton.width * 0.05
+        height: zoomInButton.height * 0.8
+
+        Rectangle {
+            radius: width * 0.2
+            anchors.centerIn: parent
+
+            width: zoomInButton.width * 0.01
+            height: parent.height * 0.8
+
+            color: _root.contentColor
+        }
+    }
+
+    Button {
+        id: zoomOutButton
+        flat: true
+
+        anchors.left: buttonSeparator.right
+        anchors.top: zoomInButton.top
+        width: height
+        height: zoomInButton.height
+
+        property bool holding: false
+
+        onPressed: {
+            _root.zoomOut()
+        }
+
+        onPressAndHold: {
+            holding = true
+        }
+
+        onReleased: {
+            holding = false
+        }
+
+        background: Rectangle {
+            anchors.fill: zoomOutButton
+            radius: zoomOutButton.width/2
+
+            color: _root.mainColor
+        }
+
+        contentItem: Item {
+            anchors.fill: zoomOutButton
+            Rectangle {
+                id: zoomOutMinusRectangle
+                anchors.centerIn: parent
+
+                width: zoomInMinusRectangle.width
+                height: zoomInMinusRectangle.height
+
+                color: _root.contentColor
+            }
+        }
+    }
+
+    // Zoom buttons background
+    Rectangle {
+        color: _root.mainColor
+        z: -1
+
+        anchors.left: zoomInButton.horizontalCenter
+        anchors.right: zoomOutButton.horizontalCenter
+        anchors.top: zoomInButton.top
+        anchors.bottom: zoomOutButton.bottom
+    }
+
+    onStateChanged: {
+        if(state == "ZoomingIn") {
+            _root.continuousZoomStart(true)
+        }
+        else if(state == "ZoomingOut") {
+            _root.continuousZoomStart(false)
+        }
+        else {
+            _root.continuousZoomStop()
+        }
+    }
+
+    state: "None"
+    states: [
+        State {
+            name: "None"
+            when: zoomInButton.holding === false && zoomOutButton.holding === false
+        },
+        State {
+            name: "ZoomingIn"
+            when: zoomInButton.holding === true
+        },
+        State {
+            name: "ZoomingOut"
+            when: zoomOutButton.holding === true
+        }
+    ]
+}

custom-example/res/Custom/Camera/qmldir

@@ -0,0 +1,3 @@
+module Custom.Camera
+
+ZoomControl 1.0 ZoomControl.qml

custom-example/res/CustomCameraControl.qml

@@ -28,6 +28,7 @@ import QGroundControl.Vehicle           1.0
 
 import CustomQuickInterface             1.0
 import Custom.Widgets                   1.0
+import Custom.Camera                    1.0
 
 Item {
     height:         mainColumn.height
@@ -416,6 +417,29 @@ Item {
                 }
             }
         }
+        //-- Zoom Buttons
+        ZoomControl {
+            id:             zoomControl
+            visible:        _hasZoom
+            mainColor:      qgcPal.window
+            contentColor:   qgcPal.text
+            fontPointSize:  ScreenTools.defaultFontPointSize * 1.25
+            zoomLevelVisible: false
+            zoomLevel:      _hasZoom ? _camera.zoomLevel : NaN
+            anchors.horizontalCenter: parent.horizontalCenter
+            onZoomIn: {
+                _camera.stepZoom(1)
+            }
+            onZoomOut: {
+                _camera.stepZoom(-1)
+            }
+            onContinuousZoomStart: {
+                _camera.startZoom(zoomIn ? 1 : -1)
+            }
+            onContinuousZoomStop: {
+                _camera.stopZoom()
+            }
+        }
     }
     //-------------------------------------------------------------------------
     //-- Camera Settings

custom-example/src/CustomPlugin.cc

@@ -205,6 +205,7 @@ CustomPlugin::createRootWindow(QObject *parent)
     QQmlApplicationEngine* pEngine = new QQmlApplicationEngine(parent);
     pEngine->addImportPath("qrc:/qml");
     pEngine->addImportPath("qrc:/Custom/Widgets");
+    pEngine->addImportPath("qrc:/Custom/Camera");
     pEngine->rootContext()->setContextProperty("joystickManager",   qgcApp()->toolbox()->joystickManager());
     pEngine->rootContext()->setContextProperty("debugMessageModel", AppMessages::getModel());
     pEngine->load(QUrl(QStringLiteral("qrc:/qml/MainRootWindow.qml")));

src/Camera/QGCCameraControl.cc

@@ -626,7 +626,7 @@ QGCCameraControl::startZoom(int direction)
         _vehicle->sendMavCommand(
             _compID,                                // Target component
             MAV_CMD_SET_CAMERA_ZOOM,                // Command id
-            true,                                   // ShowError
+            false,                                  // ShowError
             ZOOM_TYPE_CONTINUOUS,                   // Zoom type
             direction);                             // Direction (-1 wide, 1 tele)
     }
@@ -641,7 +641,7 @@ QGCCameraControl::stopZoom()
         _vehicle->sendMavCommand(
             _compID,                                // Target component
             MAV_CMD_SET_CAMERA_ZOOM,                // Command id
-            true,                                   // ShowError
+            false,                                  // ShowError
             ZOOM_TYPE_CONTINUOUS,                   // Zoom type
             0);                                     // Direction (-1 wide, 1 tele)
     }