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source: trunk/workshop-routing-foss4g/web/GeoExt/docs/_sources/lib/GeoExt/widgets/LayerOpacitySlider.txt @ 76

Revision 76, 3.9 KB checked in by djay, 10 years ago (diff)

Ajout du répertoire web

  • Property svn:executable set to *
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1
2.. currentmodule:: GeoExt
3
4:class:`GeoExt.LayerOpacitySlider`
5================================================================================
6
7
8.. cssclass:: meta
9
10
11Extends
12    * `Ext.Slider <http://dev.sencha.com/deploy/dev/docs/?class=Ext.Slider>`_
13   
14
15
16
17xtype
18    ``gx_opacityslider``
19
20
21
22
23.. class:: LayerOpacitySlider(config)
24
25    Create a slider for controlling a layer's opacity.
26
27
28
29Example Use
30-----------
31
32Sample code to render a slider outside the map viewport:
33
34.. code-block:: javascript
35
36    var slider = new GeoExt.LayerOpacitySlider({
37        renderTo: document.body,
38        width: 200,
39        layer: layer
40    });
41
42Sample code to add a slider to a map panel:
43
44.. code-block:: javascript
45
46    var layer = new OpenLayers.Layer.WMS(
47        "Global Imagery",
48        "http://maps.opengeo.org/geowebcache/service/wms",
49        {layers: "bluemarble"}
50    );
51    var panel = new GeoExt.MapPanel({
52        renderTo: document.body,
53        height: 300,
54        width: 400,
55        map: {
56            controls: [new OpenLayers.Control.Navigation()]
57        },
58        layers: [layer],
59        extent: [-5, 35, 15, 55],
60        items: [{
61            xtype: "gx_opacityslider",
62            layer: layer,
63            aggressive: true,
64            vertical: true,
65            height: 100,
66            x: 10,
67            y: 20
68        }]
69    });
70
71   
72
73
74Config Options
75--------------
76
77Configuration properties in addition to
78those listed for `Ext.Slider <http://dev.sencha.com/deploy/dev/docs/?class=Ext.Slider>`_.
79
80
81.. describe:: aggressive
82
83    ``Boolean``
84    If set to true, the opacity is changed as soon as the thumb is moved.
85    Otherwise when the thumb is released (default).
86
87.. describe:: changeVisibility
88
89    ``Boolean``
90    If set to true, the layer's visibility is handled by the
91    slider, the slider makes the layer invisible when its
92    value is changed to the min value, and makes the layer
93    visible again when its value goes from the min value
94    to some other value. The layer passed to the constructor
95    must be visible, as its visibility is fully handled by
96    the slider. Defaults to false.
97
98.. describe:: changeVisibilityDelay
99
100    ``Number`` Time in milliseconds before changing the layer's visibility.
101    If the value changes again within that time, the layer's visibility
102    change does not occur. Only applicable if changeVisibility is true.
103    Defaults to 5.
104
105.. describe:: complementaryLayer
106
107    ``OpenLayers.Layer`` or :class:`GeoExt.data.LayerRecord`
108    If provided, a layer that will be made invisible (its visibility is
109    set to false) when the slider value is set to its max value. If this
110    slider is used to fade visibility between to layers, setting
111    ``complementaryLayer`` and ``changeVisibility`` will make sure that
112    only visible tiles are loaded when the slider is set to its min or max
113    value. (optional)
114
115.. describe:: delay
116
117    ``Number`` Time in milliseconds before setting the opacity value to the
118    layer. If the value change again within that time, the original value
119    is not set. Only applicable if aggressive is true.
120
121.. describe:: inverse
122
123    ``Boolean``
124    If true, we will work with transparency instead of with opacity.
125    Defaults to false.
126
127.. describe:: layer
128
129    ``OpenLayers.Layer`` or :class:`GeoExt.data.LayerRecord`
130    The layer this slider changes the opacity of. (required)
131
132.. describe:: value
133
134    ``Number``
135    The value to initialize the slider with. This value is
136    taken into account only if the layer's opacity is null.
137    If the layer's opacity is null and this value is not
138    defined in the config object then the slider initializes
139    it to the max value.
140
141
142
143
144
145
146Public Methods
147--------------
148
149Public methods in addition to those
150listed for `Ext.Slider <http://dev.sencha.com/deploy/dev/docs/?class=Ext.Slider>`_.
151
152
153.. method:: LayerOpacitySlider.setLayer
154
155    :param layer: ``OpenLayers.Layer`` or :class:`GeoExt.data.LayerRecord`
156   
157    Bind a new layer to the opacity slider.
158
159
160
161
162
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