Develop Reference

How to change the title of Timepicker and localization in custom renderer

I have Xamarin forms time picker following custom renderer for IOS
[assembly: ExportRenderer(typeof(TimePicker), typeof(Time24PickerRenderer))]
namespace LabOraTimeStamp.iOS.Renderers
{
public class Time24PickerRenderer:TimePickerRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<TimePicker> e)
{
base.OnElementChanged(e);
var timePicker = (UIDatePicker)Control.InputView;
timePicker.Locale = new NSLocale("no_nb");
//Get the Done button
var toolbar = (UIToolbar)Control.InputAccessoryView;
var doneBtn = toolbar.Items[1];
//Set the Done to OK
doneBtn.Title = "OK";
}
}
}
I wanted to change the default "done" to "Ok".
1) How can I do that? the line mentioned above for setting the title does not affect anything.
2) I already implemented localization for xamarin forms.I just wanted to use existing Resx values from custom renderer to show the string for appropriate culture.How can I achieve that?

So the reason why your code isn't working is because the done button is created with the UIBarButtonSystemItem.Done style. It doesn't care about the Title property. Renderer code here.
To work around that issue you could try replacing the Xamarin created done button with your own custom Ok button.
//Get the Done button
var toolbar = (UIToolbar)Control.InputAccessoryView;
// Replace Xamarin's buttons with custom ones.
var spacer = new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace);
var doneButton = new UIBarButtonItem();
doneButton.Title = "OK";
doneButton.Clicked += (o, a) => Control.ResignFirstResponder();
toolbar.SetItems(new [] { spacer, doneButton}, false);

How to add a ListBox programmatically in a Form

I started out C# very recently and sorry if this question sounds dumb.
How do I add a Listbox in a Form that pops out from a Button click?
Note: The Form isn't the one that's added from the Solution Explorer whereby I can just drag a Listbox from the Toolbox to my Form.
So what I want is to create a ListBox in my file drawer1Form where I can add additional items. Thanks for the help in advance!:)
private void drawer1button_Click(object sender, EventArgs e) // Drawer 1 Button
{
drawer1Form df1 = new drawer1Form();
df1.StartPosition = FormStartPosition.CenterScreen;
df1.Show();
}
public partial class drawer1Form : Form // Creates drawer1Form
{
public drawer1Form()
{
Text = "Drawer 1 ";
}
}

Pretty much the same way as you'd do with any other object.
In the class of your form add a
private ListBox myAwesomeListBox;
Then in the button event handler add something like this:
myAwesomeListBox = new ListBox();
myAwesomeListBox.SuspendLayout();
// set all the properties that you want
myAwesomeListBox.Name = "myAwesomeListBox";
myAwesomeListBox.Location = new Point(...); // place it somewhere
myAwesomeListBox.Size = new Size(...); // give it a size
// etc...
df1.Controls.Add(myAwesomeListBox);
myAwesomeListBox.ResumeLayout();
This should be it.
I highly advise you to do it through the designer first though, and then take a look at the generated code in the form's .Designer.cs file, you'll have a very good understanding after reading through that.

C# Can't change labels and button properties from a dialogbox

I have my main form and a dialogbox which is called from main. In my main form I have a label and a button that which properties I can't change. I'm using Visual Studio 2015, not sure if there is a bug regarding this. I also made sure my label and button are set to public to modify.
Code: (this is from the dialog box, this has a list box the function is triggered at selectindexchange)
else if ((short)lbDiscountTypes.SelectedValue == 2) //Senior
{
frm_Main main = new frm_Main();
main.VAT = false;
main.labelStatus.Text = "NON-VAT (SENIOR)";
main.labelStatus.BackColor = System.Drawing.Color.IndianRed;
main.labelStatus.ForeColor = System.Drawing.Color.WhiteSmoke;
main.btnNonVat.Enabled = false;
main.btnNonVat.BackColor = System.Drawing.Color.SlateGray;
main.btnNonVat.ForeColor = System.Drawing.Color.Navy;
main.labelVatAmount.Text = 0.00m.ToString();
main.Dispose();
//INQUIRE DISCOUNT TYPES
var Discount = GC.CSHR_DiscountTypes.Where(Filter => Filter.DiscountCode == (short)lbDiscountTypes.SelectedValue);
decimal DP = 0.00m;
foreach (var item in Discount)
{
DP = item.DiscountPercentage;
}
foreach (var item in GC.CSHR_SORepo
.Where(Filter => Filter.Machine == MACHINE
&& Filter.SalesOrderNum == SALESORDERNUM
&& Filter.First_SRP == Filter.IMFSRP))
{
item.DiscountAmount = (item.SoldSRP * DP) / 100;
item.TotalAmount = (item.Quantity * item.SoldSRP) - item.DiscountAmount;
item.VATableSalesOnTotalAmount = (item.Quantity * item.SoldSRP) - item.DiscountAmount;
item.VATRate = 0.00m;
GC.SaveChanges();
}
Close();
}
The code below //INQUIRE DISCOUNT TYPES works well but not the one on top.
I've used debug mode to check if the lines are not being skipped over and they aren't.

You should pay attention to:
You are creating a new instance of your main form that you don't need (while it is open behind the dialog), so you need to get it not create a new instance
You are disposing the main form you created. main.Dispose();
In fact you are creating a new instance of main form and assigning values to those controls and then dispose it. While and instance of yor main form that you expect to see changes on it, is open and untouched behind your dialog.
To set value of those controls you can do one of these ways:
Option 1
Make your labelStatus and btnNonVat public. Open your main form in designer and select labelStatus and btnNonVat and in property grid, set Modifier to public. Then write this code:
//var main = Application.OpenForms.OfType<frm_Main>().FirstOrDefault();
var main = (frm_Main)Application.OpenForms["frm_Main"];
main.labelStatus.Text = "NON-VAT (SENIOR)";
main.labelStatus.BackColor = System.Drawing.Color.IndianRed;
main.labelStatus.ForeColor = System.Drawing.Color.WhiteSmoke;
main.btnNonVat.Enabled = false;
main.btnNonVat.BackColor = System.Drawing.Color.SlateGray;
main.btnNonVat.ForeColor = System.Drawing.Color.Navy;
main.labelVatAmount.Text = 0.00m.ToString();
Option 2
Pass an instance of your frm_Main to your dialog and work with it.
Option 3
After closing the dialog, use values from dialog and set values of your main form

Looks like you are trying to create new form using frm_Main main = new frm_Main(); syntax. All you need to do is get the instance of your current form.
var _currentMainForm= Application.OpenForms[0];
or if you have given name to your form
var _currentMainForm = Application.OpenForms["MainFormName"];
Once you get the reference you can perform all your label updates.

The code on top creates a new form, changes the labels and then disposes the form.
I think you should change the labels of the existing form.

Like in the other answer said you are setting properties of controls into a new Form object and not in the form where you come from.
You should pass the form object into the parameters of the dialog, something like:
void myDialog(frm_Main callingForm)
{
callingForm.Textbox1.Text = "abc";
}
And call it from you main form like this
...
myDialog(this);

How to show setting flyout by using button instead of setting charms

By using Callisto I wrote a code that adds setting charms.
Underneath I attach one:
// Register handler for CommandsRequested events from the setting pane
SettingsPane.GetForCurrentView().CommandsRequested += OnCommandsRequested;
void OnCommandsRequested(SettingsPane sender, SettingsPaneCommandsRequestedEventArgs args)
{
// Add an Adding Feeds command
var add = new SettingsCommand("add", "Add new Feed", (handler) =>
{
var settings = new SettingsFlyout();
settings.Content = new AddingPageUserControl();
settings.HeaderBrush = (SolidColorBrush)Application.Current.Resources["UserControlBackgraund"];
settings.Background = (SolidColorBrush)Application.Current.Resources["UserControlBackgraund"];
settings.HeaderText = "Add new Feed";
settings.IsOpen = true;
});
args.Request.ApplicationCommands.Add(add);
}
And I don't know how to create a button in AppBar which opens the same setting flyout as I use to open it by setting charms. My question is: is it possible to create it if yes I need a sort of hint.

You can find the AppBar using Page.BottomAppBar and use FindName method to find a specific button and add a handler to that.
The only point is you are currently creating your SettingFlyout inside an anonymous function, so only place you can do that would be inside your anonymous function.

Adding/Removing events based on context

I am new to C# and WinForms. I have some objects with the right click (context menu) events. However, depending on the context (for example depending on whether the user is in the wizard screen or the main screen), I want to alter what the right click does. I googled a bit and found that I can use += and -= operators but I still could not achieve what I want to do. Given the code below, for example,
Any ideas ?
EDIT: I want the OnClickCard behave differently in different places.
Sammple Code:
public override ContextMenuStrip GetContextMenuStrip(GoView view)
{
if (Selectable)
{
ContextMenuStrip contextMenu = new ContextMenuStrip();
if (!Empty)
{
// this is just for example so not showing the implementation
contextMenu.Items.Add(new ToolStripMenuItem(
"Delete",
null,
new EventHandler(OnClickDelete)));
}
// Empty
else
{
ToolStripMenuItem addCard = new ToolStripMenuItem("Add");
foreach (..some data..)
{
ToolStripMenuItem card = new ToolStripMenuItem(
data,
null,
new EventHandler(OnClickCard));
addCard.DropDownItems.Add(card);
}
}
}
else
{
return null;
}
}
private void OnClickCard(object sender, EventArgs e)
{
ToolStripMenuItem cardItem = (ToolStripMenuItem)sender;
if (cardItem.Text.Contains("ABC"))
{
Common.Forms.FormMMUSettings f = new FormMMUSettings(cardItem.Text,ParentMagazine.NextSite);
f.Show();
}
SetCard(new MagazineCard(2, cardItem.Text));
}

Are you saying you want to change the contents of the context menu depending on the circumstances when it's clicked? If so, the easiest way is to create multiple context menus, and just use an event to set whichever context menu you want.
ContextMenu menu1 = new ContextMenu();
MenuItem menu1Item1 = new MenuItem();
menu1Item1.Header = "Menu 1 Item 1";
menu1Item1.Click += new RoutedEventHandler(menu1Item1Clicked);
menu1.Items.Add(mnu1Item1);
MenuItem menu1Item2 = new MenuItem();
menu1Item2.Header = "Menu 1 Item 2";
menu1Item2.Click += new RoutedEventHandler(menu1Item2Clicked);
menu1.Items.Add(menu1Item2);
ContextMenu menu2 = new ContextMenu();
MenuItem menu2Item1 = new MenuItem();
menu2Item1.Header = "Menu 2 Item 1";
menu2Item1.Click += new RoutedEventHandler(menu2Item1Clicked);
menu2.Items.Add(menu2Item1);
MenuItem menu2Item2 = new MenuItem();
menu2Item2.Header = "Menu 2 Item 2";
menu2Item2.Click += new RoutedEventHandler(menu2Item2Clicked);
menu2.Items.Add(menu2Item2);
public void menu1Item1Clicked(object sender, EventArgs e)
{
}
etc..
Now you can just set whichever menu you need using:
myForm.ContextMenu = menu1;
Hope this helps.

+= and -= should work just fine but I'd suggest you to use a kind of handlers repo where you'd switch which handler to use. This should work like a strategy pattern where different wizard steps would be different strategies.
It would be easier to help you if you'll show us some code and point us which code parts do not work properly.

You seem to suggest that you would like to attach different handlers depending on context:
if(that)
obj.event += HandleThat;
else
obj.event += HandleSomethingElse;
That should work, but you can also do it in one handler:
obj.event += HandleAll;
void HandleAll(object sender, EventArgs arg) {
if(that)
HandleThat();
else
HandleSomethingElse();
}
EDIT: ok, your edited question really meant something else.
First obvious problem is that you add OnClickDelete as a handler, and show the implementation of OnClickCard which will not be called in your example. If it is a typo, then you just need to implement the handler method as you need. What part exactly is not working?