I have a Label and a Progess Indicator in my Vaadin indicator. It is dynamically made visible in the UI. There is a Tree below this Progress Indicator.
When the program dynamically sets the visibility of the Progress Indicator to true, the tree shifts down and the UI shakes due to the shifting.
Is there any way to make a Vaadin component occupy it's space, even if it is invisible and hence, when made visible it must not try to borrow space from other UI components?
What I am looking for is a feature similar to setRendered(true) in flex and actionscript programming.
Thanks for your help.
Finally I got an answer to my question. I just replaced the invisible components with a dummy visible label with no text.
And used it alternatively to switch between visible and invisible.
I asked the question in the Vaadin forum, and here's the response I got, from Kim Leppanen:
With Vaadin 7, if you set a component's visibility to false, then the component's information is not sent to the browser at all - it is just as if the component wouldn't exist in the layout at all.
I can quickly come up with two solutions. If you know the size of the component whose visibility you want to toggle, then you can use placeholder components - such as a Label. Put a label with the correct size in the place where you want the component. When you want to set a component as visible, then replace the label with the actual component.
The second option is to use css. Apply the css attribute "visibility: hidden" for the component you want to hide. Note that the component is not "truly" hidden. Let's say that it is a button. A user could still inspect the DOM tree and see the button in the code, change the visibility of the component on the client side (eg using developer tools or firebug) and then see and use the button as if it would be visible in the layout.
I am putting it here because people might add some more useful answers there. For a detailed explanation please see this.
Use this following example to the component you want set invisible but keeping its occupied space:
Image home = new Image();
home.setSource(HOME);
home.addStyleName("visibility: hidden");
OR
home.addStyleName("visibility: collapse");
Related
I'd like to create a layout to show this table in list view, the point is to make the text field resizable according to content. I have try several method, but all fails. I am using FileMaker 12.
Any help much appreciated.
For Browse mode you can set layout objects to dynamically resize based on the layout size, but not on the object contents. If you need this functionality in Browse mode you will probably need to use a web-viewer.
In Preview mode you can use sliding left and sliding up for reduction of the size of the layout objects, but there is no option to expand.
In Browse and Find modes, if a field isn't set to have a scroll bar, the field will expand while the user is entering data, but only then. It will return to the default size when the user navigates to another field or another record.
In Preview mode, you can make the field larger than it could possibly need and set it to slide up and also reduce the size of the enclosing part. But the user won't be able to interact with the interface of the layout (can't click buttons, change data, etc.).
A workaround might be to use a tooltip. If you set the tooltip to the contents of the field itself, then the user can hover over the field to see any expanded contents.
If you really need exactly the functionality that you mention (which I would define as having field height and enclosing body part expand in list view based on the field's content length while in FileMaker), the only way I could see doing it would be to use custom web publishing to create a web page and use FileMaker's web viewer to show that web page. F 'n' web has an article that might be of some assistance if you go this route.
I have some experience with GWT . In GWT , widget.setVisible() method will add style="display:none" style to widget. But component of vaadin wouldn't . I checked with firebug , I can't see my component while set component's visible to false. Why ?
I think that should be also have hidden style instead of not containing. I reallize that vaadin's codes were server side. But sometimes , if I would like to just hidden (set style display to none) , has there anyway to accomplish this instead of using css ?
I don't understand concept of what different between without adding component and setVisible(false) ?
As you already noticed, an invisible component is not transferred from server to browser, and from browser's point of view the component doesn't exist. This approach has to benefits:
Less data to transfer from server to client
Security: User cannot inspect invisible components' generated HTML with tools like Firebug because those doesn't exist on the browser.
So basically from browser's point of view it's the same thing that you don't add it to the UI at all. But usually it's just easier to toggle component's visibility instead of adding and removing it from its parent.
If you want to hide components with CSS, you can do it by defining your own theme and adding a style for that there. Then just apply the style for the component you want to hide by using the addStyleName method.
SETVISIBLE Sets the visibility of the component.
Visible components are drawn in the user interface, while invisible ones are not. The effect is not merely a cosmetic CSS change - no information about an invisible component will be sent to the client. The effect is thus the same as removing the component from its parent.
So as the documentation says invisible components are not not visible.
I'm relatively new to programming and my problem is with a TMainMenu on my form.
I researched a lot (a whole lot) of sites for a solution, but haven't found any that solves this exact problem.
The main menu won't resize, not even when I change the fontsize using Screen.MenuFont.Size. I tried setting the Height property in the OnMeasureItem handler, I tried resizing the images and sub-menuitems at both design- and runtime, I even tried capturing Windows' message WMDrawItem and changing it's parameter before passing it on...
The menu items in the component are resized accordingly, but the vertical height of the menubar itself isn't. (the line seen on the picture below cutting through the icons)
Is there an easy solution to this, like setting some well hidden height property somewhere?
Or do I have to rewrite half of delphi's code to achieve my goal?
Help with code examples are appreciated. :-)
Here's an image:
I am using Delphi 7 on a Win7 machine.
The height of the menu bar is a Windows metric setting. Thus it is valid system wide - not only for your application. If at all, it can only be changed via the display settings of Windows itself.
I would recommend to use TActionMainMenuBar instead. It is much more flexible then the TMainMenu.
You can change the font of the menu bar very easy as well.
I would like to add an icon to the header of my data grid as it is done in Thunderbird.
There is an icon that is above the vertical scrollbar, no matter the position of the horizontal scrollbar. This icon allows the setup of the columns.
In Delphi there a lot of different grid components, that allow customizations and adding icons to there cells / header cells. But I could not find any component that has an area above the vertical scrollbar that is fixed, which when clicked allows some action. I could even use the VirtualTreeView component to emulate the grid, if it turns out to be easier to customize that component.
I am looking for some guidance on what need to be done to get that functionality.
Thanks,
Thomas
VirtualTreeView in Listbox mode would be nice, because of it's speed, great documentation and ease use in MVC-like patterns. Delphi tempts to store data in the visual components themselves, which letter causes troubles. While VTW allwos the same, it also allows to acutally separate data from GUI, and i like it.
But i am surprised by your claim "which when clicked allows some action.".
Even most basic components allow it:
http://docwiki.embarcadero.com/Libraries/XE2/en/Vcl.Grids.TCustomGrid.OnFixedCellClick
So could you make more detaiils, why you cannot use standard components ? with screenshot and editors, how u want it rendered, where you want to click and what kind of action should happen ?
We have developed a software. In this software we are show and hiding a few controls on various input screens depending on various situations.
When we hid a control what happens is that the space occupied by that control is left as it is and layout looks very bad at times esp. in screens that have larger numbers of controls. Our client does not like this and has asked us to do something about this.
My question:
Is there some way by which we can create Fluid Layouts so that when a control is hidden the rest of the controls automatically adjusts themselves to fill the empty space left by the control hidden and when the control is show they should automatically make way for the control and adjust themselves accordingly.
I know we can achieve this by coding but that will require a lot of code in each screen for adjusting the layout. I am looking something which will reduce coding in each screen as there are 80+ screens.
Please suggest some way which is less error pron and can get rid of unnecessary coding in each input screen.
I think your best option is to use a component that handles the layout of your vcl controls on your form in runtime (depending on the conditions that you define). I recommend you try the Devexpress ExpressLayout Control
you can find two great demo videos here
ExpressLayout Control - How to Customize Layout Views
ExpressLayout Control - Create and Customize a Simple Layout
(source: devexpress.com)
You can check these features
Auto-Management - Control groups and individual control elements are automatically managed by the Layout Control. You never worry about pixel-by-pixel positioning.
Form auto-sizing - The form can be automatically resized to fit its contents best.
Bye.
Now, I'm not sure how complex layout you have, but I guess you can use TFlowPanel and/or TGridPanel for this. Flowpanel has a nice handling of components that change visiblity. I'm not sure how well gridpanel handles the same...
What kind of controls are you dynamically hiding, and what do you mean with auto fill space?
I do not know if it is as this simple: place controls on panels, and use align alTop/alClient/alBottom. When you hide a panel, all other panels will move automatically up.
One problem though: if you want to show a panel again, the order of panels can sometimes be screwed up... Can be fixed by manually setting .Top property, or "hide" by setting .Height := 1;
What I would do with a complex layout is actually split it up into several tabs. This has two advantages. It simplifies the form layout, and allows you to show and hide whole tabs depending on choices made in other tabs.
Raize Components have a TRzFlowPanel UI component. Does exactly what you're after.
Use TRzFlowPanel to put an empty flow panel on a form. The major difference between a traditional panel and a flow panel is the way in which controls are placed. With a traditional panel, you place a control (such as a button) in a specific location. You can freely move that control to any location within the panel using the mouse. In a flow panel, each control is placed in a specific location, regardless of where you place it with the mouse. The automatic location is controlled by the FlowStyle property. For example, using the default FlowStyle property of LeftRightTopBottom, the first control you add to the flow panel snaps to the top left corner. The second control that you add snaps next to the first control, and so on.