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) 2012-2013 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 2.0
  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     property alias scaleAcquired: policy.scaleAcquired
  35
  36     property Camera camera: null
  37     property Item currentItem
  38     property bool error: false
  39     property int currentPolicyMode: CameraResources.None
  40
  41     onCurrentItemChanged: {
  42         if (state == "on" || state == "policyLost") {
  43             startCamera()
  44         }
  45     }
  46
  47     Connections {
  48         target: currentItem
  49         onPolicyModeChanged: {
  50             if (state == "on" || state == "policyLost") {
  51                 startCamera()
  52             }
  53         }
  54     }
  55
  56     CameraResources {
  57         id: policy
  58     }
  59
  60     function startCamera() {
  61         if (error) {
  62             return
  63         } else if ((currentPolicyMode == currentItem.policyMode) && camera.running) {
  64             return
  65         } else if (!policy.acquire(currentItem.policyMode)) {
  66             console.log("Failed to acquire policy resources")
  67             return
  68         } else if (currentItem.policyMode == CameraResources.Player) {
  69             currentPolicyMode = CameraResources.Player
  70             camera.stop(true)
  71         } else if (!camera.start()) {
  72             showError(qsTr("Failed to start camera. Please restart the application."))
  73         } else {
  74             currentPolicyMode = currentItem.policyMode
  75         }
  76     }
  77
  78     function stopCamera() {
  79         if (camera.stop(false)) {
  80             policy.acquire(CameraResources.None)
  81             currentPolicyMode = CameraResources.None
  82             error = false
  83         }
  84     }
  85
  86     function forceStopCamera() {
  87         // We don't release resources here so we can get them back
  88         // when they become available
  89         currentItem.policyLost()
  90         camera.stop(true)
  91         currentPolicyMode = CameraResources.None
  92         error = false
  93     }
  94
  95     state: "off"
  96
  97 //    onStateChanged: console.log("New state " + handler.state);
  98
  99     states: [
 100         State {
 101             name: "on"
 102             when: Qt.application.active && currentItem && currentItem.policyMode != CameraResources.None && !policy.hijacked
 103         },
 104         State {
 105             name: "off"
 106             when: (!Qt.application.active && camera.idle) || (currentItem && currentItem.policyMode == CameraResources.None && camera.idle)
 107         },
 108         State {
 109             name: "policyLost"
 110             when: policy.hijacked
 111         },
 112         State {
 113             name: "error"
 114         }
 115     ]
 116
 117     transitions: [
 118         Transition {
 119             to: "off"
 120             ScriptAction {
 121                 script: stopCamera()
 122             }
 123         },
 124         Transition {
 125             from: "off"
 126             to: "on"
 127             ScriptAction {
 128                 script: handler.startCamera()
 129             }
 130         },
 131         Transition {
 132             from: "on"
 133             to: "policyLost"
 134             ScriptAction {
 135                 script: forceStopCamera()
 136             }
 137         },
 138         Transition {
 139             from: "policyLost"
 140             to: "off"
 141             ScriptAction {
 142                 script: stopCamera()
 143             }
 144         },
 145         Transition {
 146             from: "policyLost"
 147             to: "on"
 148             ScriptAction {
 149                 script: startCamera()
 150             }
 151         }
 152     ]
 153 }