On the GWT developer site there is an example showing a panel that is in the middle of a page. Is this possible to have a fixed with panel in the middle of a page using the GWT layoutpanels?
http://code.google.com/webtoolkit/doc/latest/DevGuideUiPanels.html#LayoutPanels
On
I don't think you can make a fixed-width layer center itself automatically in a LayoutPanel. However, you can insert the layer into the DOM to get its size, and then calculate the proper offsets yourself. You can see how Google does this (not in a LayoutPanel) in the code for DialogBox.center();
On
There's a good old CSS trick for centering fixed-size, absolute boxes, using automatic CSS layouting (no JavaScript required):
top: 50%; left: 50%;Example:
<!doctype html>
<html>
<head>
<style type="text/css">
.box {
position: absolute;
background-color: red;
height: 300px; width: 400px; /* Using "px" here, but you */
/* can also use "em" etc. */
top: 50%; left: 50%;
margin-top: -150px; margin-left: -200px;
}
</style>
</head>
<body>
<div class="box">Box</div>
</body>
</html>
Apply this style to your LayoutPanel - I don't have a full code example for that, but I think it should be possible.
You can achieve the effect with simple css. For example:
Once the basic effect is created in plain CSS using absolutely-positioned objects, you can recreate it with the LayoutPanels, since they're essentially a CSS constraint system.