I need to develop a control which is similar to the Nested Grid in the Smart GWT.
User will be having a column for expansion images, when user clicking on the image in a particular row, a sub grid has to be opened there itself. Here all remaining rows needs to move down.
How can i achieve that functionality? Can anybody give me some clues so that i can proceed.
I have already a grid which is a celltable with custom header(with search functionality implemented).
Thanks,
Saritha.
Create your nested widget (myNestedWidget) that you want to show. It should have a CSS style "position: absolute", unless your grid is added to the LayoutPanel (or similar), in which case you can position your widget directly. Let's call the parent widget of your grid gridParentWidget.
In your CellTable add the following handler:
myTable.addCellPreviewHandler(new Handler<myObject>() {
#Override
public void onCellPreview(CellPreviewEvent<myObject> event) {
if ("click".equals(event.getNativeEvent().getType())) {
if (event.getColumn() == 0) {
int top = myTable.getRowElement(event.getIndex()).getAbsoluteBottom();
int left = myTable.getRowElement(event.getIndex()).getAbsoluteLeft();
myNestedWidget.getElement().getStyle().setTop(top, Unit.PX);
myNestedWidget.getElement().getStyle().setLeft(left, Unit.PX);
gridParentWidget.add(myNestedWidget);
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
#Override
public void execute() {
int height = myNestedWidget.getOffsetHeight();
myTable.getRowElement(event.getIndex()).getStyle().setHeight(height + "px");
]
});
}
}
});
}
This is obviously an outline of the solution. The details of the implementation may vary slightly depending on which widgets you use for your parent widget and your nested widget. If you change z-indexes somewhere, you have to take it into account too. You also need to make sure that your nested widget fits into the width of your grid, or you'll need to wrap it in a ScrollPanel and set a width to it explicitly.
Related
The essence of the problem is that I want to write my own version of the AppBar that would include content as another Compose function. After looking at the source code of the current CollapsingTopAppBar implementation, I saw the following lines:
#Composable
private fun TwoRowsTopAppBar(
...
scrollBehavior: TopAppBarScrollBehavior?
) {
...
val pinnedHeightPx: Float = 64.dp
val maxHeightPx: Float = 152.dp
LocalDensity.current.run {
pinnedHeightPx = pinnedHeight.toPx()
maxHeightPx = maxHeight.toPx()
}
// Sets the app bar's height offset limit to hide just the bottom title area and keep top title
// visible when collapsed.
SideEffect {
if (scrollBehavior?.state?.heightOffsetLimit != pinnedHeightPx - maxHeightPx) {
scrollBehavior?.state?.heightOffsetLimit = pinnedHeightPx - maxHeightPx
}
}
...
Surface(...) {
Column {
TopAppBarLayout(
...
heightPx = pinnedHeightPx
...
)
TopAppBarLayout(
...
heightPx = maxHeightPx - pinnedHeightPx + (scrollBehavior?.state?.heightOffset
?: 0f),
...
)
}
}
}
As I understand it, scrollBehavior is used to handle the collapse and expansion behavior. In the current implementation, just constant values are put in heightOffsetLimit. And since I need my appbar implementation to be able to contain content of any size, I need to somehow know the size of this content in advance and put this value in heightOffsetLimit.
I have already written the code for my AppBar, so that it also contains content. But since I can't pass the height value of the content to scrollBehavior, the AppBar doesn't collapse to the end.
you need to calculate the height that the appbar will have before drawing it into the screen. I have followed this issue and solved my problem with the last solution. hope it helps:
Get height of element Jetpack Compose
use the content you can put (ex. an image or a huge text) as the MainContent
use your appbar as the DependentContent and use the size given in lambda to give the height to your appbar
finally set placeMainContent false as I believe you don't need to draw the image (or any other composable) directly in a box
and you will good to go
I thought this would be like pretty simple task to do, but now I have tried for hours and cant figure out how to get around this.
I have a list of friends which should be displayed in a scrollable list. Each friend have a profile image and a name associated to him, so each item in the list should display the image and the name.
The problem is that I cant figure out how to make a flexible container that contains both the image and the name label. I want to be able to change the width and height dynamically so that the image and the text will scale and move accordingly.
I am using Unity 5 and Unity UI.
I want to achieve the following for the container:
The width and height of the container should be flexible
The image is a child of the container and should be left aligned, the height should fill the container height and should keep its aspect ratio.
The name label is a child of the contianer and should be left aligned to the image with 15 px left padding. The width of the text should fill the rest of the space in the container.
Hope this is illustrated well in the following attached image:
I asked the same question here on Unity Answers, but no answers so far. Is it really possible that such a simple task is not doable in Unity UI without using code?
Thanks a lot for your time!
Looks like can be achieved with layout components.
The image is a child of the container and should be left aligned, the height should fill the container height and should keep its aspect ratio.
For this try to add Aspect Ratio Fitter Component with Aspect mode - Width Controls Height
The name label is a child of the container and should be left aligned to the image with 15 px left padding. The width of the text should fill the rest of the space in the container.
For this you can simply anchor and stretch your label to the container size and use BestFit option on the Text component
We never found a way to do this without code. I am very unsatisfied that such a simple task cannot be done in the current UI system.
We did create the following layout script that does the trick (tanks to Angry Ant for helping us out). The script is attached to the text label:
using UnityEngine;
using UnityEngine.EventSystems;
[RequireComponent (typeof (RectTransform))]
public class IndentByHeightFitter : UIBehaviour, UnityEngine.UI.ILayoutSelfController
{
public enum Edge
{
Left,
Right
}
[SerializeField] Edge m_Edge = Edge.Left;
[SerializeField] float border;
public virtual void SetLayoutHorizontal ()
{
UpdateRect ();
}
public virtual void SetLayoutVertical() {}
#if UNITY_EDITOR
protected override void OnValidate ()
{
UpdateRect ();
}
#endif
protected override void OnRectTransformDimensionsChange ()
{
UpdateRect ();
}
Vector2 GetParentSize ()
{
RectTransform parent = transform.parent as RectTransform;
return parent == null ? Vector2.zero : parent.rect.size;
}
RectTransform.Edge IndentEdgeToRectEdge (Edge edge)
{
return edge == Edge.Left ? RectTransform.Edge.Left : RectTransform.Edge.Right;
}
void UpdateRect ()
{
RectTransform rect = (RectTransform)transform;
Vector2 parentSize = GetParentSize ();
rect.SetInsetAndSizeFromParentEdge (IndentEdgeToRectEdge (m_Edge), parentSize.y + border, parentSize.x - parentSize.y);
}
}
I Build a scrollViewer and its elements in my ViewModel, and it's built into a property FrameworkElement PageElement I rebuild the pageElement every time some event happens, I want to bind the PageElement to a real scrollViewer in the View so that whenever I change pageElement, it draws itself in it's view.
Let me give you a little armchair advice. I don't know the details of your project but the details in your question make me draw a few conclusions.
First, to have your view model create UI elements is not wrong. But it is really unusual. It sounds like you might be missing the concept of data template or data template selector.
Using a data template allows you to have a rich presentation of data that is built as the individual record is generated and rendered in a repeater or in a single content control.
Using a data template selector allows you to have various different presentations of data that using code-behind logic will switch between based on data or other criteria.
Ref on templates: http://blog.jerrynixon.com/2012/08/windows-8-beauty-tip-using.html
Second, to have your UI be re-generated as the result of an event being raised sounds like a short path to performance problems.
Every time you manually create elements and add them to the visual tree, you put your app at risk of binding lag while the layout is re-rendered. Run your app on an ARM and I bet you may already see it. Then again, a simplistic UI may not suffer from this general rule of thumb.
Because I do not know the event, I cannot presume it is frequently occurring. However, if it is frequently occurring, then even a simplistic UI will suffer from this.
Now to answer your question
Sherif, there is no write-enabled property on a scrollviewer that will set the horizontal or vertical offset. The only way to set the offset of a scrollviewer is to call changeview().
var s = new ScrollViewer();
s.ChangeView(0, 100, 0);
You cannot bind to a method, so binding to something like this is a non-starter without some code-behind to read the desired offset and calling the method directly.
Something like this:
public sealed partial class MainPage : Page
{
MyViewModel _Vm = new MyViewModel();
ScrollViewer _S = new ScrollViewer();
public MainPage()
{
this.InitializeComponent();
this._Vm.PropertyChanged += (s, e) =>
{
if (e.PropertyName.Equals("Offset"))
_S.ChangeView(0, _Vm.Offset, 0);
};
}
}
public class MyViewModel : INotifyPropertyChanged
{
private int _Offset;
public int Offset
{
get { return _Offset; }
set
{
_Offset = value;
PropertyChanged(this, new PropertyChangedEventArgs("Offset"));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
But let me caution you. The offset will need to be based on something. And those variables may change based on the window size, the font size, scaling from transforms, and lots of other factors. The code above will work most of the time, but it will possible fail frequently on other devices.
So, what to do? My recommendation is that you code this in your code-behind, monitoring for whatever scenario you feel would require a scroll, and simply programmatically scroll it from bode-behind. Beware, though, programmatically scrolling a scrollviewer could make your UI confusing to the user.
You know your app. You will have to choose.
Best of luck!
I'm developing an application in javaFx and I'm using TabPane to organise content. My problem is that when I put a node as the content of a tab, and then set the background of that same node, the background color gets kind of blurry, as you can see in the image, the background color was defined in a css file.
If anyone knows how to resolve this, would really appreciate the help.
http://i.stack.imgur.com/h3gNH.png
I think you are a victim of this issue:
JavaFX Image (PNG) transparency crispness being lost when rendering
It will likely be fixed in a forthcoming (i.e. Java 8) release.
For now, you may be able to use the work-around documented in the linked question's answer.
To do this, place your image in a CenteredRegion and use that as the first element of a StackPane placed in your tab. Then layer the rest of the tab content over the image by adding the content to the StackPane. It's a bit awkward and there may be a more straight-forward solution for your particular case.
class CenteredRegion extends Region {
private Node content;
CenteredRegion(Node content) {
this.content = content;
getChildren().add(content);
}
#Override protected void layoutChildren() {
content.relocate(
Math.round(getWidth() / 2 - content.prefWidth(USE_PREF_SIZE) / 2),
Math.round(getHeight() / 2 - content.prefHeight(USE_PREF_SIZE) / 2)
);
}
public Node getContent() {
return content;
}
}
In my project I need to create some play,pause,stop buttons in one composite.
For that I created one composite and added these buttons there. Also I have added the images
for each button. But after drawing, it does not look good. I mean images on the buttons does not look good.Clients are not satisfied. Now is it possible to add Images to Label and give some Toggle button actions to the label? I know I can add images to the label. But when I click the label,it does not give button effect..
If you want a custom look for your 'buttons' you could use labels with custom images (one for the normal state and one for the "pushed" state. Something like:
final Label stop = new Label(composite, SWT.NONE);
stop.setSize(STOP_IMG.getImageData().width, STOP_IMG.getImageData().height)
stop.setBackgroundImage(STOP_IMG);
stop.addMouseListener(new MouseAdapter()
{
#Override
public void mouseUp(MouseEvent e)
{
stop.setBackgroundImage(STOP_IMG);
}
#Override
public void mouseDown(MouseEvent e)
{
stop.setBackgroundImage(STOP_DOWN_IMG);
// DO ACTION
}
});
For a nice UI you could also add a MouseTrack listener and have different images for the mouse over states.
Disadvantage of this is you are making it less accessible as it will only respond to mouse events. If you go for this approach you should look at creating your own class that extends MouseAdapter, and takes the label, images and action to invoke in a constructor so you don't end up with tonnes of very similar anonymous classes.
I have used toolbars in the past to achieve a nice effect.
This will create a toolbar with an item that behaves like a regular button:
//Toolbar button
ToolBar toolBar = new ToolBar(composite,SWT.FLAT);
ToolItem toolItem = new ToolItem(toolBar,SWT.PUSH);
toolItem.setImage(image);
This will a toolbar with an item that has toggle behaviour:
//Create a toggle effect
ToolBar toggleToolBar = new ToolBar(composite,SWT.FLAT);
ToolItem toggleToolItem = new ToolItem(toggleToolBar,SWT.CHECK);
toggleToolItem.setImage(image);