Qt 5.13 | Qt Quick Demo - Photo Surface

Qt 5.13.2 Reference Documentation

# Qt Quick Demo - Photo Surface

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      import QtQuick 2.6
      import QtQuick.Dialogs 1.0
      import QtQuick.Window 2.1
      import Qt.labs.folderlistmodel 1.0

      Window {
          id: root
          visible: true
          width: 1024; height: 600
          color: "black"
          property int highestZ: 0
          property real defaultSize: 200
          property var currentFrame: undefined
          property real surfaceViewportRatio: 1.5

          FileDialog {
              id: fileDialog
              title: "Choose a folder with some images"
              selectFolder: true
              folder: picturesLocation
              onAccepted: folderModel.folder = fileUrl + "/"
          }

          Flickable {
              id: flick
              anchors.fill: parent
              contentWidth: width * surfaceViewportRatio
              contentHeight: height * surfaceViewportRatio
              Repeater {
                  model: FolderListModel {
                      id: folderModel
                      objectName: "folderModel"
                      showDirs: false
                      nameFilters: imageNameFilters
                  }
                  Rectangle {
                      id: photoFrame
                      width: image.width * (1 + 0.10 * image.height / image.width)
                      height: image.height * 1.10
                      scale: defaultSize / Math.max(image.sourceSize.width, image.sourceSize.height)
                      Behavior on scale { NumberAnimation { duration: 200 } }
                      Behavior on x { NumberAnimation { duration: 200 } }
                      Behavior on y { NumberAnimation { duration: 200 } }
                      border.color: "black"
                      border.width: 2
                      smooth: true
                      antialiasing: true
                      Component.onCompleted: {
                          x = Math.random() * root.width - width / 2
                          y = Math.random() * root.height - height / 2
                          rotation = Math.random() * 13 - 6
                      }
                      Image {
                          id: image
                          anchors.centerIn: parent
                          fillMode: Image.PreserveAspectFit
                          source: folderModel.folder + fileName
                          antialiasing: true
                      }
                      PinchArea {
                          anchors.fill: parent
                          pinch.target: photoFrame
                          pinch.minimumRotation: -360
                          pinch.maximumRotation: 360
                          pinch.minimumScale: 0.1
                          pinch.maximumScale: 10
                          pinch.dragAxis: Pinch.XAndYAxis
                          onPinchStarted: setFrameColor();
                          property real zRestore: 0
                          onSmartZoom: {
                              if (pinch.scale > 0) {
                                  photoFrame.rotation = 0;
                                  photoFrame.scale = Math.min(root.width, root.height) / Math.max(image.sourceSize.width, image.sourceSize.height) * 0.85
                                  photoFrame.x = flick.contentX + (flick.width - photoFrame.width) / 2
                                  photoFrame.y = flick.contentY + (flick.height - photoFrame.height) / 2
                                  zRestore = photoFrame.z
                                  photoFrame.z = ++root.highestZ;
                              } else {
                                  photoFrame.rotation = pinch.previousAngle
                                  photoFrame.scale = pinch.previousScale
                                  photoFrame.x = pinch.previousCenter.x - photoFrame.width / 2
                                  photoFrame.y = pinch.previousCenter.y - photoFrame.height / 2
                                  photoFrame.z = zRestore
                                  --root.highestZ
                              }
                          }

                          MouseArea {
                              id: dragArea
                              hoverEnabled: true
                              anchors.fill: parent
                              drag.target: photoFrame
                              scrollGestureEnabled: false  // 2-finger-flick gesture should pass through to the Flickable
                              onPressed: {
                                  photoFrame.z = ++root.highestZ;
                                  parent.setFrameColor();
                              }
                              onEntered: parent.setFrameColor();
                              onWheel: {
                                  if (wheel.modifiers & Qt.ControlModifier) {
                                      photoFrame.rotation += wheel.angleDelta.y / 120 * 5;
                                      if (Math.abs(photoFrame.rotation) < 4)
                                          photoFrame.rotation = 0;
                                  } else {
                                      photoFrame.rotation += wheel.angleDelta.x / 120;
                                      if (Math.abs(photoFrame.rotation) < 0.6)
                                          photoFrame.rotation = 0;
                                      var scaleBefore = photoFrame.scale;
                                      photoFrame.scale += photoFrame.scale * wheel.angleDelta.y / 120 / 10;
                                  }
                              }
                          }
                          function setFrameColor() {
                              if (currentFrame)
                                  currentFrame.border.color = "black";
                              currentFrame = photoFrame;
                              currentFrame.border.color = "red";
                          }
                      }
                  }
              }
          }

          Rectangle {
              id: verticalScrollDecorator
              anchors.right: parent.right
              anchors.margins: 2
              color: "cyan"
              border.color: "black"
              border.width: 1
              width: 5
              radius: 2
              antialiasing: true
              height: flick.height * (flick.height / flick.contentHeight) - (width - anchors.margins) * 2
              y: (flick.contentY - flick.originY) * (flick.height / flick.contentHeight)
              NumberAnimation on opacity { id: vfade; to: 0; duration: 500 }
              onYChanged: { opacity = 1.0; scrollFadeTimer.restart() }
          }

          Rectangle {
              id: horizontalScrollDecorator
              anchors.bottom: parent.bottom
              anchors.margins: 2
              color: "cyan"
              border.color: "black"
              border.width: 1
              height: 5
              radius: 2
              antialiasing: true
              width: flick.width * (flick.width / flick.contentWidth) - (height - anchors.margins) * 2
              x: (flick.contentX - flick.originY) * (flick.width / flick.contentWidth)
              NumberAnimation on opacity { id: hfade; to: 0; duration: 500 }
              onXChanged: { opacity = 1.0; scrollFadeTimer.restart() }
          }

          Timer { id: scrollFadeTimer; interval: 1000; onTriggered: { hfade.start(); vfade.start() } }

          Image {
              anchors.top: parent.top
              anchors.left: parent.left
              anchors.margins: 10
              source: "resources/folder.png"
              MouseArea {
                  anchors.fill: parent
                  anchors.margins: -10
                  onClicked: fileDialog.open()
                  hoverEnabled: true
                  onPositionChanged: {
                      tooltip.visible = false
                      hoverTimer.start()
                  }
                  onExited: {
                      tooltip.visible = false
                      hoverTimer.stop()
                  }
                  Timer {
                      id: hoverTimer
                      interval: 1000
                      onTriggered: {
                          tooltip.x = parent.mouseX
                          tooltip.y = parent.mouseY
                          tooltip.visible = true
                      }
                  }
                  Rectangle {
                      id: tooltip
                      border.color: "black"
                      color: "beige"
                      width: tooltipText.implicitWidth + 8
                      height: tooltipText.implicitHeight + 8
                      visible: false
                      Text {
                          id: tooltipText
                          anchors.centerIn: parent
                          text: "Open an image directory (" + openShortcut.sequenceString + ")"
                      }
                  }
              }
              Shortcut {
                  id: openShortcut
                  sequence: StandardKey.Open
                  onActivated: fileDialog.open()
              }
          }

          Text {
              anchors.bottom: parent.bottom
              anchors.left: parent.left
              anchors.right: parent.right
              anchors.margins: 10
              color: "darkgrey"
              wrapMode: Text.WordWrap
              font.pointSize: 8
              text: "On a touchscreen: use two fingers to zoom and rotate, one finger to drag\n" +
                    "With a mouse: drag normally, use the vertical wheel to zoom, horizontal wheel to rotate, or hold Ctrl while using the vertical wheel to rotate"
          }

          Shortcut { sequence: StandardKey.Quit; onActivated: Qt.quit() }

          Component.onCompleted: {
              if (typeof contextInitialUrl !== 'undefined') {
                  // Launched from C++ with context properties set.
                  imageNameFilters = contextImageNameFilters;
                  picturesLocation = contextPicturesLocation;
                  if (contextInitialUrl == "")
                      fileDialog.open();
                  else
                      folderModel.folder = contextInitialUrl + "/";
              } else {
                  // Launched via QML viewer without context properties set.
                  fileDialog.open();
              }
          }

          property var imageNameFilters : ["*.png", "*.jpg", "*.gif"];
          property string picturesLocation : "";
      }