Creating Layers in Java

Painting QR Code JIS X 0510 in Java Creating Layers

Layers can hold most of the kinds of content you d place in the body of a document, such as text, graphics, JavaScript, flash movies, and more When you re ready to add content to a layer, place the insertion point inside the layer and either paste information, begin typing, or insert content using any of the options on the Insert menu, Insert bar, or Assets panel

A nested layer is a layer that s controlled by, but not necessarily inside of, another layer More simply, think of nested layers as having an interesting parent-child relationship where the child layer can move or function independently of the parent layer, but when the parent layer moves or hides, the child does too The HTML code of a nested layer is inside the code of the parent layer, which you can see when you view the source code, even though the nested layer may appear elsewhere on the screen due to absolute positioning Nested layers can be useful, for example, when creating custom navigation menus or when using layers that need to hide and show at the same time Figure 1-3 shows an example of how a nested layer appears in Design view, Code view, and the Layers panel

Figure 1-3: Nested layers are easy to identify in Code view and in the Layers panel, but may be difficult to spot in Design view

Before you can create nested layers, make sure that the Nesting preference is enabled in the Preferences dialog box (as described in the next section) Then follow these steps to create a nested layer:

3 To reposition the nested layer (the second layer) anywhere in the document, select the nested layer in the Layers panel to make it active, and do one of the following: Press the arrow keys to move the layer Click a selection handle and drag the layer to its new location

When inserting layers onto a page, the layers are added using the default dimensions and other attributes as specified in the Layers category of the Preferences dialog box For example, if Dreamweaver s default layer width

and height is set to 200 x 115 pixels, all new layers are added to the page at that default size unless you add a layer to the page by drawing it (see the Drawing a layer section earlier in this chapter) You can edit the default layer size settings at any time by following these steps:

the layer attributes, as shown in Figure 1-4

or hidden from view when the page loads in the browser), select an option from the Visibility drop-down list Options include Default (visible), Visible, Hidden, and Inherit

5 To specify a color for the default background color for all new layers,

select a color from the Background Color palette or enter a hexadecimal value Be sure to enter the number symbol before the hexadecimal value, as in #FF0000

The nesting option enables you to draw a layer inside the bounds of another layer To toggle this feature on or off when drawing layers, hold Alt (Windows) or Option (Mac)

the Netscape 4 compatibility feature Dreamweaver automatically adds the following JavaScript code to the head of the current page, which fixes a known browser resizing bug in Netscape 4:

<script type= text/JavaScript > <!-function MM_reloadPage(init) { //reloads the window if Nav4 resized if (init==true) with (navigator) {if ((appName== Netscape )&&(parseInt(appVersion)==4)) { documentMM_pgW=innerWidth; documentMM_pgH=innerHeight; onresize=MM_reloadPage; }} else if (innerWidth!=documentMM_pgW || innerHeight!=documentMM_pgH) locationreload(); } MM_reloadPage(true); //--> </script>

category and enable the Anchor Points for Layers option When you enable this option, each layer has its own yellow anchor point marker, which can assist greatly in the selection of specific layers in Design view, especially when several layers overlap or have visibility set to hidden