cgit.sxemacs.org Git - harmattan/cameraplus/blob - qml/PipelineManager.qml

   1 // -*- qml -*-
   2
   3 /*!
   4  * This file is part of CameraPlus.
   5  *
   6  * Copyright (C) 2012 Mohammed Sameer <msameer@foolab.org>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  21  */
  22
  23 import QtQuick 1.1
  24 import QtCamera 1.0
  25 import CameraPlus 1.0
  26
  27 Item {
  28         id: handler
  29
  30         property bool showStandBy: state != "on"
  31
  32         property alias acquired: policy.acquired
  33         property alias hijacked: policy.hijacked
  34
  35         property Camera camera: null
  36         property Item currentPage: pageStack.currentPage
  37
  38         onCurrentPageChanged: {
  39                 if (state == "on" || state == "policyLost") {
  40                         startCamera();
  41                 }
  42         }
  43
  44         CameraResources {
  45                 id: policy
  46         }
  47
  48         function startCamera() {
  49                 if (!policy.acquire(currentPage.policyMode)) {
  50                         console.log("Failed to acquire policy resources");
  51                         return;
  52                 }
  53
  54                 if (!camera.start()) {
  55                         showError(qsTr("Failed to start camera. Please restart the application."));
  56                 }
  57         }
  58
  59         function stopCamera() {
  60                 if (camera.stop(false)) {
  61                         policy.acquire(CameraResources.None);
  62                 }
  63         }
  64
  65         function forceStopCamera() {
  66                 // We don't release resources here so we can get them back
  67                 // when they become available
  68                 camera.stop(true);
  69         }
  70
  71         state: "off"
  72
  73 //        onStateChanged: console.log("New state " + handler.state);
  74
  75         states: [
  76         State {
  77                 name: "on"
  78                 when: Qt.application.active && currentPage && currentPage.needsPipeline && !policy.hijacked
  79         },
  80         State {
  81                 name: "off"
  82                 when: (!Qt.application.active && camera.idle) || (currentPage && !currentPage.needsPipeline)
  83         },
  84         State {
  85                 name: "policyLost"
  86                 when: policy.hijacked
  87         },
  88         State {
  89                 name: "error"
  90         }
  91         ]
  92
  93         transitions: [
  94         Transition {
  95                 to: "off"
  96                 ScriptAction {
  97                         script: stopCamera();
  98                 }
  99         },
 100         Transition {
 101                 from: "off"
 102                 to: "on"
 103                 ScriptAction {
 104                         script: handler.startCamera();
 105                 }
 106         },
 107
 108         Transition {
 109                 from: "on"
 110                 to: "policyLost"
 111                 ScriptAction {
 112                         script: forceStopCamera();
 113                 }
 114         },
 115
 116         Transition {
 117                 from: "policyLost"
 118                 to: "off"
 119                 ScriptAction {
 120                         script: stopCamera();
 121                 }
 122         },
 123         Transition {
 124                 from: "policyLost"
 125                 to: "on"
 126                 ScriptAction {
 127                         script: startCamera();
 128                 }
 129         }
 130         ]
 131 }