I have a border layout in ExtJS where there is a north panel which, in turn, has several panels nested in it.
The "parent" north panel is collapsible and has a splitter. The problem is, whenever I move the splitter, the other panels are repainted too late.
Example: if my panel is 300px and I resize it to 320px, my panels remain 300px. If i resize again to, say, 350px, the panels get resized to 320px.
The parent panel's layout mode is set to "auto" by default.
When I set the layout mode of the parent panel to "vbox", the other panels resize appropriately in width. However, these child-panels are expandable/collapsible as well, and with the vbox layout I can no longer expand them fluently.
Anyone have a clue what's going on/how to fix the lag?
Edit: after further investigation, it appears to only affect the headers of the panels, not the panels themselves.
I fixed it (for now) by adding the following to the parent panel, even though it's laggy...
listeners: {
resize: function() {
Ext.each(this.items.items, function(child){
var w = child.getWidth();
child.getHeader().setWidth(w);
});
}
}
Related
I have used the EventManager.onWindowResize event to handle window resize to adjust my layout. It works fine only for the Viewport. I want my inner commponents, viz. Grids and Panels to be adjusted accordingly. Is there a way to achieve this? I have written custom code to handle the resize individually for every component. Which works fine for my grids and panels. But, the panel headers don't resize! They are just stuck there.
My layout is as follows:
[Viewport]
[Form Panel]
[Panel containing Grid] [Panel containing Grid]
[/Form Panel]
[/Viewport]
The Grids resize but not the Panel which contains the Grid. Moreover, I've used anchor, but my percent widths are ignored.
Any default way to implement resize?
Used anchor layout everywhere. The Viewport required some JS code, but anchor solved my problem. Thanks everyone for their inputs.
We have many screens where different types of GWT panels are used.
One common problem across many screens is that, content size is derived at runtime. So, if I define a height for a panel(Vertical/Horizontal/DockPanel) and when any new components are getting added within panel or content is more, panel height remains the same. So we are not able to see the contents. UI look and feel becomes worst.
How do we handle the height problems? Do we have to manually code to adjust every panel/widget height when something gets changed in screen. Is it not a very bad way of coding?
Also, now we have datagrids at some places, if no of records are very less, we see a huge space left out below datagrid, not sure how do we handle these cases?
Updated below with few examples as per the comment:
Do you mean to say that whenever we know that content grows vertically, we can always choose FlowPanel. Because, some of the screens we have used Vertical panel/Horizontal Panel and inside that when user clicks something a new fields getting added and shown. So Vertical Panel/Horizontal Panel height automatically not getting adjusted. One more example is that we have main Vertical Panel within a Dock Layout Panel content area and inside that there are some widgets whose content may vary. So now if I use a FlowPanel to the content which varies in size, what about outer panels? Will get it adjusted? Again to say the kind of panels we have used - Dock Layout Panel is used with fixed header, footer, left menu and Content area. A scroll panel is used within Content area. All our different widgets go inside this which is mix and match of horizontal/vertical/datagrids..etc.
In GWT (and HTML) you can either set the height of a panel or let it expand naturally. In general, once you set the height of something, you lose the ability to let it expand naturally.
Some Panels in GWT implicitly set their own height (or require that you set their height) and so are never good choices for dynamically sized content. LayoutPanels and ScrollPanels, for example, can never adjust dynamically, and expect you to provide size information programmatically. FlowPanels and HTMLPanels, on the other hand, are great for dynamic heights and would rather you not set their height explicitly.
If you want a scrolling panel, of course you have to define how high it should be - how else could it know when to scroll and when to just get bigger? But, you can put a FlowPanel (which expands automatically) inside a ScrollPanel (which you have set at 800px or whatever). Then, as you add content to the FlowPanel, it will expand inside the ScrollPanel. Users can then scroll to see different parts of the FlowPanel.
Trouble-shooting tips:
Make sure you aren't setting the height on panels that you want to expand naturally
Make sure you ARE setting the height on panels that should always be the same size
Try using FlowPanels instead of Horizontal/VerticalPanels
*LayoutPanels and AbsolutePanels always need explicit sizes and can never grow dynamically as you add more content. Anything you want to grow with content should probably be a FlowPanel or HTMLPanel.
Is there a way to get horizontal scrolling implemented in a horizontal panel ?
or any other panel can be used to achieve the functionality mentioned below -
The requirement is that i am creating a search bar where search items are being added as and when user inputs them (something similar to this - http://documentcloud.github.com/visualsearch/)
Well i got the functionality working and even the looks are similar but struggling on the horizontal panel. I am using a horizontal panel as a search bar and it has a suggest box embedded in it. so when user inputs data the search items are added to the horizontal panel. but as and when search items are added the horizontal panel grows in size and moves out of the screen and browser's horizontal scroll bar appears. But i wanted a scroll bar on the horizontal panel itself.
Can this be achieved ?
want some ideas ... any help is appreciated.
Thanks.
You may want to use the css overflow-x attribute. If you want it to scroll set the value to scroll or auto. If you need to constraint the size of the div in specific ways you may need to control it progamatically.
I don't see any other solution than place your HorizontalPanel inside a scroll panel.
Then I would add a CSS property to prevent the vertical scrollbar from showing.
Here's an ui.xml excerpt:
<ui:style>
.scrollHorizontal{
overflow-y: hidden !important;
/* !important used to force override the style "overflow:scroll"
of the ScrollPanel */
}
</ui:style>
<g:ScrollPanel addStyleNames="scrollHorizontal">
<g:HorizontalPanel ui:field="resultsPanel" />
</g:ScrollPanel>
You may need to check the client height of your scroll panel so as to adjust the height of the items inside the horizontal panel, depending on your layout.
I'm using a GWT popup panel for displaying some information stacked up vertically in my jsp page. The problem I'm facing is that, once the popup panel is displayed, it doesn't hold on to its set position. I'm setting the position of the popup panel using setPopupPosition().
However, whenever the user scrolls the browser, the popup panel displayed moves up and down accordingly. It doesn't maintain its original position, where it was displayed.
I've tried setting the css property to (position: fixed;) applied on the popup panel, but it doesn't work. I read someplace, that in order for an html element to be displayed statically, we can use the position: fixed, and width: 100% to achieve that. But in my case, I can't set the width to 100%, since I need the popup panel to be displayed for a specific size.
Is there a way to achieve the fixed position of the popup panel in GWT? Would I have to listen to browser's scrollbar events in order to fix the position or can it be handled differently.
This is my piece of code, which I use to set the popup panel's position in GWT.
final PopupPanel simplePopup = new PopupPanel(false);
_beamMenu = simplePopup;
rendererDisplay(response, simplePopup,true);
int left =_beamIcon.getAbsoluteLeft() + _beamIcon.getOffsetWidth() - simplePopup.getOffsetWidth();
int top = _beamIcon.getAbsoluteTop() - simplePopup.getOffsetHeight();
simplePopup.setPopupPosition(left, top);
Any help in this regard will be highly appreciated.
Many thanks,
Asheesh
add a css with: position: fixed !important;
The default behavior of the PopupPanel should be enough. You actually want position: absolute and not fixed. (See http://www.quirksmode.org/css/position.html for an explanation of position types, but fixed is when it appears to float as you scroll).
The issue you are likely running into, is that when you show the PopupPanel, it gets removed from wherever it was in the DOM, and added to the RootPanel:
(This is from GWT 2.4 so your exact code may very)
public void show() {
if (showing) {
return;
} else if (isAttached()) {
// The popup is attached directly to another panel, so we need to remove
// it from its parent before showing it. This is a weird use case, but
// since PopupPanel is a Widget, its legal.
this.removeFromParent();
}
resizeAnimation.setState(true, false);
}
...
public void setState(boolean showing, boolean isUnloading) {
...
RootPanel.get().add(curPanel);
...
}
As a result, though the position: absolute should be enough, likely your other top level Widgets are also absolutely positioned. Therefore, when you scroll the page you are likely actually scrolling the contents of one of your other widgets, and the PopupPanel is stuck to the outer element, which does not have a large offset-height and is not being scrolled. This is why it appears to have the same behavior as if it were using fixed positioning (i.e. always XX pixels from the top and side of the browser window).
Go back and look at your page construction and fix the other Widgets and you should be fine. From my observations, the new LayoutPanels use position: absolute all over the place, so you may have to manually set it to relative.
How to place a control at the center of a canvas?
I have a main VLayout set to 100% width and 100% height. I want to place a grid at the center of this layout, meaning at the center of the browser's "viewport". How to do that with smartGWT layouts?
setLayoutAlign(Alignment.CENTER)
This places the controls center to the layout's breadth axis. But if I nest HLayout and VLayout it is not giving desired results.
you have to set the layoutAlign on all nested Layout panels.
the configuration is not inherited from parent panels and while HLayout defaults to TOP, VLayout defaults to LEFT.
Also, make sure that you call:
parentWidget.addMember(childWidget), instead of: parentWidget.addChild(childWidget)
The first one obeys setLayoutAlign(), but the last one doesn't.