Basically I have three radio buttons and only want one button selected at at time, of course when created they are independent of each other. Currently, I use change listeners to interweave the buttons and it works in my context just fine. But, I realize this really isn't the best way because the code becomes cumbersome when more buttons are needed or if a particular section of code goes under many changes and several other reasons. So, how can I better integrate radio buttons (or anything where behavior depends on the integration of multiple controls <-- if someone wants to rephrase this please do so)?
Use a ToggleGroup:
A class which contains a reference to all Toggles whose selected
variables should be managed such that only a single Toggle within the
ToggleGroup may be selected at any one time.
There is an example in the RadioButton javadoc:
ToggleGroup group = new ToggleGroup();
RadioButton button1 = new RadioButton("select first");
button1.setToggleGroup(group);
button1.setSelected(true);
RadioButton button2 = new RadioButton("select second");
button2.setToggleGroup(group);
Related
I am writing a Windows Forms application in VB.NET. I have three forms: the main form, which shows a list of accounts, the account form which allows the user to view/edit the information for a specific account, and the policy form which allows the user to view/edit the information on a specific policy for that account. I want the forms to appear as if they are all the same window. Example: when the application starts, the user clicks an account name in the list box on the main form and clicks "edit". What I want to happen is that the window stays in the exact same place and stays the same exact size, only the content of the main form appears to be replaced with the content of the account form. Same thing if the user then chooses to edit a policy from the account form. When the user finishes and clicks "save", the main form comes back up. Through this entire use case, it would appear to the user as if they were viewing the same window the entire time, with the content of that window changing.
How can I do this? I have tried something like:
Dim newForm as New AcctForm
newForm.Location = Me.Location
newForm.Show()
Me.Close()
The problem is that if the user moves the original window, the new window appears where the parent form originally appeared, not where it ended up.
I see this is already in the comments, but what I have done in this case in the past is build each "form" in the application as a custom control. Then I have one actual form, and navigation works by changing which custom control is currently loaded on the parent form. To move from one screen/view to another, you remove the current custom control from the form's controls collection and add the new custom control.
I believe this is superior to manually setting the startup position and size, because you can use the form's .SuspendLayout()/.ResumeLayout() methods to hide the interim state, where there is no control loaded, from the user. This is harder to do when you want one form to be completely replaced by another.
This also makes it easy to set certain form properties in one place and have them be consistent for the application. You can even have an area on the form with controls that will now show in every view.
When using this pattern, I typically have each of my custom controls inherit from a common base. You may not have anything specific you will do with that base at the outset, but it almost always comes in handy later.
Finally, switching to use this scheme is easier than you think. Just go to the code for the each of your current forms, and you will find that each class currently inherits from System.Windows.Forms.Form. Most of the time, all you really need to do is change them to inherit from System.Windows.Forms.Panel and you're most of the way there.
As others have said, it may be better to redesign your application using custom controls or panels etc.
However, to answer your question regarding the seemingly random location of your forms, the first thing to check is that each form has it's StartPosition property set to Manual.
If your main form is resizable, then I would also add code to adjust newForm to the same size too.
I hope that helps with your immediate issues; so that you can move on to redesigning the application!
good morning there is another way . set property for second form to (top most) and use also
from2.show();
that make you switch between forms and keep form2 top other
Thanks
try using ShowDialog()
Dim newForm as New AcctForm
newForm.Location = Me.Location
newForm.ShowDialog()
Me.Close() <-- removed this
I am creating a windows 8 store application using vs2012.
I am tying to switch to another xaml form by click of a button but cannot do it.
I want the code to close or hide the current form and to switch over to new form .
Regards
If you are looking to wholesale replace the content then you can use the Frame.Navigate() method.
Frame rootFrame = Window.Current.Content as Frame;
rootFrame.Navigate(typeof(YourPageClass));
or simply
this.Frame.Navigate(typeof(YourPageClass));
remember that not every elemet has property hide or something like that. If you want to hide a grid with form or do a simillar thing you need to know the property that is responsible for visibility (in most cases it is Visibility and it is a bool).
The second thing is that you can be a newbie but if you want help make some effort and give us what you want
The third thing. If you want to change a page after click use Marc`s solution
I am currently implementing drag and drop using the DataGrid provided in the Silverlight SDK and I want the user to be, easily, able to drag multiple items to another list.
The grid's selection gets updated on the MouseDown event so the only way the user have to drag multiple items is to press Shift while begining the drag operation. This is not really obvious and, for me, the natural way whould have been to just click the selected block of rows and drag them. To do so, the selection needs to be updated on the MouseUp event.
I've tried to derive from the DataGrid to inject my custom DataGridRows but the DataGrid doesn't expose a way to replace the type of rows it creates.
Anyone have a solution or ideas for this?
Thank you,
Jacques.
Yes, it's unfortunate that the selection is updated on mousedown. You will need to perform some work in the mousedown event to work around this. This codeproject article should help:
http://www.codeproject.com/Tips/338594/Drag-drop-multiple-selected-rows-of-datagridview-w
The idea is that I would have a set of forms, users would click through a "forward" and "back" button, and the current form would change to a different one. My issue is that I can write code that just pops up a new form, but im not sure how to do a "replacement" of my current form. How is this usually done?
What I did recently was to create a form with buttons already in place and a large panel to contain each step. The dialog would accept an initial step in the form of a IWizStep instance, and the things would roll from there.
Each step was a class exposing a UserControl responsible for the visual aspect of the step, while the logic itself was handled by the class (it was a little more complicated that that, but that was the general idea).
The IWizStep interface, implemented by the step and accepted by the dialog, was on the lines of:
Interface IWizStep
Event StateChanged As EventHandler
ReadOnly Property Control As Control
ReadOnly Property Title As String
ReadOnly Property CanMovePrevious As Boolean
ReadOnly Property CanMoveNext As Boolean
Function MovePrevious As IWizStep
Function MoveNext As IWizStep
End Interface
To put everything together, a controller class would know how to compose the steps necessary for each given action. Therefore I had a controller for, say, "Emit Order", which needed some 10 steps, and a controller for "Emit Orders in Batch", which needed only a couple of steps.
Create a set of UserControls, and add and remove them from a Panel in a single form. (and set Dock to Fill)
You could define a user control which acts as a "wizard". It just needs the buttons you have and an array of content panels, just have it switch through the panels when the buttons are pressed assuming a certain condition is met within the controls on the panel. There's no real definitive "wizard" maker, since it's pretty easy to roll your own wizard.
You don't need to do a "replacement" of your current form really, you could just add a new one to the project. If you do need to for whatever reason, just grab the control collection with Me.Controls, copy that somewhere, and put the new controls up. When you don't need the wizard, swap them out again. It's generally best practice to make a new form however!
In my GWT project, I'm trying to get it so two DialogBoxes can pass information between each other. One of them holds a MapWidget, and when a button is pressed in the other DialogBox, the position information is received from that other DialogBox's MapWidget. Does anyone have any tips for how I should coordinate between having two different DialogBoxes show up? Should I wrap the code for the two in a Composite? Furthermore, is there an example anywhere of dealing with two DialogBoxes at once in GWT? For example, if I click outside of the two boxes, both should be dismissed. I'm wondering if there's a way to keep both of them in focus at once, so I can switch between the two without causing either to disappear.
Sharing Data Between Dialog Boxes
In my opinion, the "correct" way to do this would be to implement some sort of MVP structure in the application so that a presenter manages the view (DialogBoxes, among other things) and knows how to pass simple data to the view for it to display (the presenter would handle the MapWidget data, the view would take care of displaying it on the DOM).
However, if you're looking for a quicker/more simpler approach, you have a couple of options (which you choose really depends on the application structure):
Create a Composite, as you mentioned, that knows how to pass the necessary data back and forth. By having the Composite manage the data object and tell the two DialogBoxes how to display it, you are actually approaching an MVP architecture within your Composite.
Subclass DialogBox into a class that contains a HandlerManager (sometimes used as an "Event Bus") that fires events when the button is pressed. You can create events that are designed to pass data back and forth between the two DialogBoxes (even make them type-safe with type parameters). See this StackOverflow question for details on using a HandlerManager. The MVP article, linked above, also has some good information on using an event bus.
Model-View-Presenter is a tried-and-true method of structuring an application that results in more testable code, better project structure, and can help guide you when making decisions like this. I strongly recommend checking it out if you haven't already.
Sharing Auto-Hide Functionality
GWT's PopupPanel (on which DialogBox is based) offers a method addAutoHidePartner(Element) which is describe thusly:
Mouse events that occur within an autoHide partner will not hide a panel set to autoHide.
So, you can create two auto-hiding DialogBoxes that only close when you click outside both of them (e.g., they do not close when you click within either of the boxes) with the following code:
// Create the dialog boxes
DialogBox dbox1 = new DialogBox(true, false);
DialogBox dbox2 = new DialogBox(true, false);
// Set some visual options
dbox1.setPopupPosition(10, 10);
dbox2.setPopupPosition(200, 10);
dbox1.setAnimationEnabled(true);
dbox2.setAnimationEnabled(false);
// Set the dialog boxes' caption and content
dbox1.setHTML("Dialog Box 1");
dbox2.setHTML("Dialog Box 2");
dbox1.setWidget(new HTML("This is the first dialog box."));
dbox2.setWidget(new HTML("This is the second dialog box."));
// Making dobx2 a partner of dbox1 means clicking
// in dbox2 won't cause dbox1 to close
dbox1.addAutoHidePartner(dbox2.getElement());
// Similarly, setting dbox1 as a partner of dbox2 means
// clicking in dbox1 won't cause dbox2 to close
dbox2.addAutoHidePartner(dbox1.getElement());
// Show the dialog boxes
dbox1.show();
dbox2.show();
You can interact with either of the dialog boxes without the other closing. Omit the appropriate call to setAutoHidePartner if you only want a one-way partnership.