Various improvements to Canvas examples

I noticed these examples were rather "aestetically
challenged" and decided to make it a test case for our
WIP style guidelines.

- Use consistent margins (12 px)
- Use proposed color palettes
- Use proposed fonts and header styles

I created a new Slider graphic and moved this into
the shared folder as I think it is useful for other examples.

I removed a lot of unused files which seem to have been added
but never actually used.

I also found several bugs in our implementation, including
not scaling or rotation around the correct origin.

In many cases I simplified the examples, removing
variables/sliders where they did not add significantly
to the example itself.

Change-Id: Ie09da33deaf56a3ec45a2031b87a24a8602e994a
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

4 files changed, 120 insertions, 0 deletions

diff --git a/examples/quick/shared/Slider.qml b/examples/quick/shared/Slider.qml
new file mode 100644
index 0000000000..d310a25bd5
--- /dev/null
+++ b/examples/quick/shared/Slider.qml
@@ -0,0 +1,117 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtQuick module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+
+Item {
+    id: slider
+    height: 26
+    width: 320
+
+    property real min: 0
+    property real max: 1
+    property real value: min + (max - min) * mousearea.value
+    property real init: min+(max-min)/2
+    property string name: "Slider"
+    property color color: "#0066cc"
+
+    Component.onCompleted: setValue(init)
+    function setValue(v) {
+       if (min < max)
+          handle.x = Math.round( v / (max - min) *
+                                (mousearea.drag.maximumX - mousearea.drag.minimumX)
+                                + mousearea.drag.minimumX);
+    }
+    Rectangle {
+        id:sliderName
+        anchors.left: parent.left
+        anchors.leftMargin: 16
+        height: childrenRect.height
+        width: Math.max(44, childrenRect.width)
+        anchors.verticalCenter: parent.verticalCenter
+        Text {
+            text: slider.name + ":"
+            font.pointSize: 12
+            color: "#333"
+        }
+    }
+
+    Rectangle{
+        id: foo
+        width: parent.width - 8 - sliderName.width
+        color: "#eee"
+        height: 7
+        radius: 3
+        antialiasing: true
+        border.color: Qt.darker(color, 1.2)
+        anchors.left: sliderName.right
+        anchors.right: parent.right
+        anchors.leftMargin: 10
+        anchors.rightMargin: 24
+        anchors.verticalCenter: parent.verticalCenter
+
+        Rectangle {
+            height: parent.height
+            anchors.left: parent.left
+            anchors.right: handle.horizontalCenter
+            color: slider.color
+            radius: 3
+            border.width: 1
+            border.color: Qt.darker(color, 1.3)
+            opacity: 0.8
+        }
+        Image {
+            id: handle
+            source: "images/slider_handle.png"
+            anchors.verticalCenter: parent.verticalCenter
+            MouseArea {
+                id: mousearea
+                anchors.fill: parent
+                anchors.margins: -4
+                drag.target: parent
+                drag.axis: Drag.XAxis
+                drag.minimumX: Math.round(-handle.width / 2 + 3)
+                drag.maximumX: Math.round(foo.width - handle.width/2 - 3)
+                property real value: (handle.x - drag.minimumX) / (drag.maximumX - drag.minimumX)
+            }
+        }
+    }
+}
diff --git a/examples/quick/shared/images/slider_handle.png b/examples/quick/shared/images/slider_handle.png
new file mode 100644
index 0000000000..63c518be7d
--- /dev/null
+++ b/examples/quick/shared/images/slider_handle.png
diff --git a/examples/quick/shared/qmldir b/examples/quick/shared/qmldir
index 2f1e56aefb..106654bbf0 100644
--- a/examples/quick/shared/qmldir
+++ b/examples/quick/shared/qmldir
@@ -1,3 +1,4 @@
 Button 2.0 Button.qml
 LauncherList 2.0 LauncherList.qml
 SimpleLauncherDelegate 2.0 SimpleLauncherDelegate.qml
+Slider 2.0 Slider.qml
diff --git a/examples/quick/shared/shared.qrc b/examples/quick/shared/shared.qrc
index 0c9f39e7b0..fba2d3eb82 100644
--- a/examples/quick/shared/shared.qrc
+++ b/examples/quick/shared/shared.qrc
@@ -3,6 +3,8 @@
         <file>LauncherList.qml</file>
         <file>SimpleLauncherDelegate.qml</file>
         <file>Button.qml</file>
+        <file>Slider.qml</file>
+        <file>images/slider_handle.png</file>
         <file>images/back.png</file>
         <file>images/next.png</file>
     </qresource>