Hi there is a control in asp.net called SiteMapPath i need something similar in WPF to help users navigate back and forth through the application pages ...
does any one know about any third party control or built in features that can help me implement this feature or should i start from scratch
Being able to display journal history can do the trick too
I don't know of any WPF controls that work like the SiteMapPath. You could use a menu or a tab control to load different views onto the page and define the menus/tabs in xml. Below are a couple of links which may help spur you on to some ideas.
WPF XML DataBinding
Bind to XLinq
For Breadcrumbs you may be interested in
code project
stack overflow
Ok i created my own breadcrumb for wpf ...
First of all since all the navigation in my application were based on wpf NavigationService i used the BackStack property of the Frame
var x = Frame.BackStack.Cast<JournalEntry>().Select((page) => page).ToList();
Now it is just a matter of binding a listbox or whatever control you want to the Name property of the List above and in my case since i just needed to keep track of previous pages i added this code to the SelectionChanged event of the listbox bound to above List
void listBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
int i = (sender as ListBox).Items.Count - (sender as ListBox).SelectedIndex;
for (; i > 0 && (sender as ListBox).SelectedIndex != -1; i--)
Frame.NavigationService.GoBack();
}
Related
So i am trying to make an accordion content holder for an uwp application. I can't find anything resembling what i want to achive in the documentation. Is this someting i need to build from scratch using stackpanels and codebehiend ect ect, or are there tools I can use within the libary which I havent found yet ?
Here Is an example of what i want. When the users clicks on a vaccine name, a content box containg information about that vaccine will dropdown. And if it is click while expanded, it will slide back up and only display the name again. An accordion.
Any suggestions, tutorials, articles on the subject will be much appreciated. Thanks in advance.
There is UWP Community Toolkit available that has an expander control that you may be able to utilize. You can get the code sample from the Windows Store and the source code is on github.
https://blogs.windows.com/buildingapps/2016/08/17/introducing-the-uwp-community-toolkit/#v6cSIzET7QwQOb8O.97
I believe from the answer that you know how to make a ListView using DataTemplate. If not search the documentation for this.
So I believe that the most important piece of the question is about the expanding.
First in your DataTemplate bind Height to your DataModel for example like this:
<Grid Height="{x:Bind Item.Height, Mode = OneWay}">...</Grid>
Then place Clicked (or Tapped if its control doesn't support Clicked) event on that arrow, and handle it in the code like this (Tapped may require different arguments but they'll appear automatically anyway):
Arrow_Clicked(object sender, RoutedEventArgs e)
{
var item = (sender as Button).DataSource as Item;
if (item.Height == 80)
item.Height = 200;
else
item.Height = 80;
}
I have a silverlight app where there is a telerik radtreeview with checkboxes. The user selects stuff and when the user wants to edit it's selection i need to pre-populate the tree with the previously saved selection.
I found out that I can bind the checkboxes to my viewmodel. But if I choose that scenario I don't use the "built in" checkboxes and lose the tristate logic (autoselecting siblings when selecting a parent and such)
So I am experimenting with trying to get the radtreeviewitem objects from the radtreeview.items collection
http://www.telerik.com/help/silverlight/radtreeview-how-to-iterate-through-treeviewitems.html
The problem is that the radtreeviewitems are only generated when a node is expanded by a user in the ui. So not all items I want to iterate through are present after the control is databound.
I have not found a good way to force the ui to build all the radtreeviewitems so I can iterate through them and set my preselection. I found the links below but it only seems to work with the root node, not the siblings.
WPF: control.ItemContainerGenerator.Status is NotStarted. How do I tell it to start now?
Would you guys also consider rebuilding the "tristate-mode" into your viewmodel logic "dirty"?
How would you go about preselecting checkboxitems in the radtreeview?
This is how I do it :
public static void CheckAllTreeItemsAuto(RadTreeView tree)
{
tree.ItemContainerGenerator.StatusChanged += (s, e) =>
{
if ((s as Telerik.Windows.Controls.ItemContainerGenerator).Status == Telerik.Windows.Controls.Primitives.GeneratorStatus.ContainersGenerated)
{
RadTreeViewItem item = (RadTreeViewItem)tree.ItemContainerGenerator.ContainerFromIndex(0);
while (item != null)
{
item.IsChecked = true;
item = item.NextItem;
}
}
};
}
I didn't experience your problem with the items not generated at the start. (I don't know how you generate your RadTreeView).
When working with the RadTreeView control you need to have in mind that the built-in tri-state logic is designed to work with declaratively defined control and items, only. This means that using this feature in MVVM scenarios will not work as expected.
Since Telerik is aware of that limitation they provided the community with an article demonstrating how developers can use the tri-state logic of a native CheckBox control in MVVM scenarios. You can find the article in their documentation. Also, at the end of the article you can find a link leading to their CodeLibrary where you can download ready to run project demonstrating the described approach.
I hope this information will help you.
In my MainPage.xaml, I created a Pivot Control: <controls:Pivot Title="Powder God" Name="PivotControl">.
My first pivot view is a HubTile that summarize all other individual pages. So my application bar will be different between the first pivot view and all other ones.
That's why I put my application bar in App.xaml's resource section, then load based on selected index of my pivot.
My question is:
In the application bar I will be using for all individual pages, I want to have a delete option, where I will remove that specific item (a view model) from my data context.
I know I can use PhoneApplicationFrame root = Application.Current.RootVisual as PhoneApplicationFrame; to access navigation services, but I don't know how can I reference to my pivot, so that I can get the selected index and proceed forward.
Thanks!
Using MVVM you SHOULDN'T do this:
((PageType)Application.Current.RootVisual).PivotControl. //Blah
PageType is whatever type PhoneApplicationFrame is that contains your PivotControl. If this doesn't work you need a Property in the RootVisual
PAGE
public Pivot MyPivot
{
get
{
return PivotControl;
}
}
APP
((PageType)RootVisual).MyPivot. //Blah
On one level Microsoft's suggestion of putting the ApplicationBar in App.xaml is great as it can be referenced from everywhere and would appear to encourage code reuse: however this question highlights the limit to this approach. An application bar is typically used to provide actions which are specific to the current page (or pivot item) and just because the buttons are the same you may not want the exact same code to run in each case.
In this case I think it would better to create a factory method that creates your common ApplicationBar with the click handlers you specify specific to your page/pivot item. For bonus points put the method in a new class (not App) so it doesn't get lost in all the boilerplate code there. Call this factory method in your page constructor and remember your ApplicationBar in your class. For multiple app bars, create them all up front and you can then easily switch between these app bars in your Pivot SelectionChanged code.
The alternative of creating the ApplicationBar in App.xaml and then retrieving this from the App.xaml.cs "Resources" ResourceDictionary in code, modifying the click callbacks, is more complicated in my opinion.
I wish they'd done a better job of implementing the ApplicationBar so people wouldn't want to do this. I've found that using the ApplicationBar forces you to add code to your Page.xaml.cs even if you use a framework like MVVM Light. This is still OK in MVVM as it's UI specific code that belongs in the View, but it makes things inconsistent if you're using ICommand everywhere else. Last time I decided it was better to create the entire ApplicationBar in code rather than hack this kind of thing via App.xaml.cs.
Update: There is a UserVoice request for a data bindable ApplicationBar.
I understand the "why" controls vanish on postback, and up until now I have had great success just creating what I need to do dynamically in page init. However this fell apart for me when I had to add some controls to a asp.net page based on the value of an existing dropdownlist.
So my question is simple, and I don't seem to be able to find a good working code example. I need to add some controls to the page based on the value of a dropdownlist. Then persist these added controls across other postbacks (session is fine).
Here is a snippet to work off of:
protected void Page_Init(System.Object sender, System.EventArgs e)
{
RebuildPlaceholder();
}
protected void ddlGroup_Change(System.Object sender, System.EventArgs e)
{
ExampleDataContext ctxExample = new ExampleDataContext();
var aryExample = (from rslt in ctxExample.mvExample
where rslt.label.ToLower() == ddlGroup.SelectedValue
select rslt);
foreach (var objExample in aryExample)
{
TextBox txtCreated = new TextBox();
txtCreated.ID = "ddl" + objExample.ID;
plcExample.Controls.Add(txtCreated);
}
StorePlaceholder();
}
private void StorePlaceholder()
{
//Need code to store all controls in a placeholder.
}
private void RebuildPlaceholder()
{
//Need code to rebuild all of the controls from Session.
}
I found this related article: Dynamically Adding Controls but I am struggling with the syntax for serializing all the controls, etc.
This can be limited to the child controls of a single placeholder that already exists on a page, just storing/restoring that placeholder's controls is what I am after.
Any version of ASP.NET is fine, if there is something that made this easy in 4.0 great.
Instead try caching the dropdown list selection. Then during the next page load use the cache to set the value selected. Then load the new controls based on that selection.
Session["CacheKey"] = DropDownList1.SelectedValue;
Then to access the Session Cache:
var value = Session["CacheKey"];
Take a look at this Microsoft article
on ASP.NET Caching
I've found that DropDownList.SelectedValue is unavailable during Page.Init. But you can still get access to the value with Request[ddl.UniqueID] and then create and add all your dynamic controls.
It feels kind of like a hack, but the ASP.NET page lifecycle doesn't allow many alternatives, particularly if your controls are not serializable.
I have asked the question "Is there something like master page in desktop applications?" Now I am in position that I have to extend the question. Thanks for understanding.
I have add one MDI master form into my project and several inherited forms that inherit MDI master one. I was using this code.
private void searchToolStripMenuItem_Click(object sender, EventArgs e)
{
foreach (Form child in this.MdiChildren)
{
child.Close();
}
Search childSearchForm = new Search();
childSearchForm.MdiParent = this;
childSearchForm.Text = "Search ";
childSearchForm.Show();
}
This code is triggered when I press some button on master form and the new in this case Search form is opened inside master.
Now my question is the right way to build desktop applications or there is some other more elegant way where content of user interface can be dynamic and switch from view to view by clicking on the buttons inside. For instance clicking on "Search" button on some search form will take you to search results grid, all that happening in one master form.
And if this is right way (which I doubt) how can I achieve to open other inside forms by clicking on buttons inside them. Also if I put some controls on masterpage they will appear two times in master form and in inherited form.
Thanks.
PS
I am using Visual Studio 2008 and MS SQL 2005.
If you are only wanting to show one view at a time you could create a new user control for each view you require. e.g One for your search results.
Then you could add a panel and clear the controls contained within the panel and add the new one to display the view you are after.
Or as described, the other option is to use a tab control, hide the tabs and set the visible index programatically.
Not sure how you would easily do this in winforms, but in WPF you could create a navigation app - a link driven navigation similar to a web browser experience but still a stand alone application. See http://msdn.microsoft.com/en-us/rampup/cc514215.aspx for details of how to get started.