I have a project and I need to know how to adding a component in a JFrame when pressing a JButton.
I have added a panel into panel by this code:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
colorPanel color0=new colorPanel();
color0.setBounds(5,150+nb,300,120);
color0.setLayout(new FlowLayout());
this.getContentPane().add(color0);
this.validate();
System.out.println("add couleur:"+nb);
nb+=50;
}
It works but the problem is that the component is deleted when I maximize or minimize the JFrame.
Thanks.
When you resize your Jframe, a repaint() & paint() methods are called which probably erases your component.
Related
how to check if an component is already in the layout?
I have an 4x4 gridlayout
with some buttons
one button is to show an datagrid
one to show inputfields
what I try to do is
MenuBar.Command tablecommand = new MenuBar.Command() {
public void menuSelected(MenuItem selectedItem) {
output.setValue("clean components");
layout2.removeComponent(name);
layout2.removeComponent(name2);
layout2.removeComponent(button);
layout2.removeComponent(cp);
//layout2.removeComponent(grid);
//if layout2 !contains grid
layout2.addComponent(grid,1,2);
}
};
without check I get an exception
java.lang.IllegalArgumentException: Component is already in the container
at com.vaadin.ui.GridLayout.addComponent
when I click on the showgrid button the second time
the only thing I can find is ".equals(obj)"
You can look if the component has a parent.
If yes, then it's already in place somewhere.
https://vaadin.com/api/com/vaadin/ui/Component.html#getParent--
Is there a way to make the ContentDialog light dismiss?, so when the user clicks on any thing outside the ContentDialog it should be closed.
Thanks.
By default, ContentDialog is placed in PopupRoot. Behind it, there is a Rectangle which dim and prevent interaction with other elements in the app. You can find it with help of VisualTreeHelper and register a Tapped event to it, so when it's tapped you can hide ContentDialog.
You can do this after calling ShowAsync outside ContentDialog code or you can do it inside ContentDialog code. Personally, I implement a class which derives from ContentElement and I override OnApplyTemplate like this:
protected override void OnApplyTemplate()
{
// this is here by default
base.OnApplyTemplate();
// get all open popups
// normally there are 2 popups, one for your ContentDialog and one for Rectangle
var popups = VisualTreeHelper.GetOpenPopups(Window.Current);
foreach (var popup in popups)
{
if (popup.Child is Rectangle)
{
// I store a refrence to Rectangle to be able to unregester event handler later
_lockRectangle = popup.Child as Rectangle;
_lockRectangle.Tapped += OnLockRectangleTapped;
}
}
}
and in OnLockRectangleTapped:
private void OnLockRectangleTapped(object sender, TappedRoutedEventArgs e)
{
this.Hide();
_lockRectangle.Tapped -= OnLockRectangleTapped;
}
Unfortunately ContentDialog does not offer such behavior.
There are two alternatives you can consider:
Popup - a special control built for this purpose, which displays dialog-like UI on top of the app content. This control actually offers a IsLightDismissEnabled for the behavior you need. Since the Anniversary Update (SDK version 1607) also has a LightDismissOverlayMode, which can be set to "On" to automatically darken the UI around the Popup when displayed. More details are on MSDN.
Custom UI - you can create a new layer on top of your existing UI in XAML, have this layer cover the entire screen and watch for the Tapped event to dismiss it when displayed. This is more cumbersome, but you have a little more control over how it is displayed
I am using WizardNewFileCreationPage to create a New File
public void addPages() {
mainPage = new WizardNewFileCreationPage("FILE", getSelection());
mainPage.setTitle("New File");
mainPage.setDescription("Add new file");
addPage(mainPage);
}
I want to add some Radio Buttons to it representing file extensions in this wizard so that users can select one of them as a file extension.
The WizardNewFileCreationPage is not meant to be extended with custom controls. From its JavaDoc:
Subclasses may override
getInitialContents
getNewFileLabel
Subclasses may extend
handleEvent
If you still want to add the radio buttons 'at your own risk', you can try to override createAdvancedControls and append you controls to the parent after calling super.
protected void createAdvancedControls(Composite parent) {
super.createAdvancedControls( parent );
Button radioButton = new Button( parent, SWT.RADIO );
// ...
}
Note that the layout of parent (currently) is a single-columned GridLayout, set the layout data accordingly.
I'm trying to do a loading icon where once you tap on the icon, it will call the following handler:
private void refresh_btn_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
refresh_btn.Visibility = System.Windows.Visibility.Collapsed;
loading_icon.Visibility = System.Windows.Visibility.Visible;
refreshMix();
}
private void refreshMix()
{
...
refresh_btn.Visibility = System.Windows.Visibility.Collapsed;
loading_icon.Visibility = System.Windows.Visibility.Visible;
}
However, the view doesn't seem to auto-reload after I change the icon visibilities before calling refreshMix(). Is there a way to force the page to reload itself?
You are probably doing some lengthy work in refreshMix() in UI thread, right? Do this work in background thread and UI thread will be free to update page.
You need set Collapsed before Visible :
control.Visibility = System.Windows.Visibility.Collapsed;
control.Visibility = System.Windows.Visibility.Visible;
Within Silverlight there is no concept of page or view re-loading. When you change the properties of any visual element, this will be reflected on the screen the next time it is rendered.
i am facing one problem in SCSF.
I have two workspaces
MdiWorkspace
DeckWorkspace
i have two views in a module
Viewer (display in mdiworkspace)
Property Viewer (in deckworkspace)
in Viewer i have a button in toolbar whose purpose is to display PropertyViewer (another View).
how can i display this PropertyViewer in deckworkspace agaist button click event.
NOTE: i am not using Command[CommandName].AddInvoker(control, "click:) and CommandHandler
I'm going to assume your toolbar sits in a SmartPart that implements the MVP pattern. Have the button click event handler in the SmartPart fire an event that its presenter will handle. Your presenter code would look like this:
// Presenter code
protected override void OnViewSet()
{
this.View.ToolbarButtonClick += View_ToolbarButtonClick;
}
public void View_ToolbarButtonClick(object sender, EventArgs e)
{
// remove the handler so the property viewer
// will only be added the first time
this.View.OnToolbarButtonClick -= View_ToolbarButtonClick;
var propertyView = new PropertyViewer();
this.WorkItem.Workspaces[WorkspaceNames.MyDeckWorkspace].Show(propertyView);
}