I just started with Xamarin forms and followed this example. But for the landscape mode it always has Navigation drawer opened. Is this default behavior? Below is my code
public class NavigationDrawer : MasterDetailPage // Navigation Drawer using MasterDetailPage
{
public override bool ShouldShowToolbarButton()
{
return true;
}
ContentPage gotoPage;
public NavigationDrawer()
{
Title = "Navigation Drawer Using MasterDetailPage";
string[] myPageNames = { "Camera2 Demo", "Second", "Third" };
SizeChanged += NavigationDrawer_SizeChanged;
ListView listView = new ListView
{
ItemsSource = myPageNames,
};
this.Master = new ContentPage
{
Title = "Options",
Content = listView,
Icon = "hamburger.png"
};
listView.ItemTapped += (sender, e) =>
{
switch (e.Item.ToString())
{
case "Camera2 Demo":
gotoPage = new CameraPage();
break;
case "Second":
gotoPage = new SecondPage();
break;
case "Third":
gotoPage = new ThirdPage();
break;
default:
gotoPage = new NavigationPage1();
break;
}
Detail = new NavigationPage(gotoPage);
((ListView)sender).SelectedItem = null;
this.IsPresented = true;
};
Detail = new NavigationPage(new HomePage());
IsPresented = false;
//// For Windows Phone, provide a way to get back to the master page.
//if (Device.OS == TargetPlatform.WinPhone)
//{
// (this.Detail as ContentPage).Content.GestureRecognizers.Add(
// new TapGestureRecognizer((view) =>
// {
// this.IsPresented = true;
// }));
//}
}
Question
1) How would I control opening and closing of Navigation Drawer? I found a way where it would give us control over the width of the navigation Drawer. Here is the Link. But is this the best option available right now?
1) Since project requires to be crossplaform Xamarin forms controls seems to be one of the option.
2) Should we go with Custom controls and not Xamarin forms controls?
I just started with Xamarin sample code would appreciate if someone can guide me through this.
1) How would I control opening and closing of Navigation Drawer?
Use this.IsPresented = true; to open and this.IsPresented = false; to close the drawer.
About the other questions I don't understand you good, but depending on your requirements, you should create custom controls or download one from NuGet.
Note:
I believe the most important thing for a beginner is to learn how to implement a native code using DependencyService and also to use Design patterns like MVVM.
You would need to set MasterBehavior = MasterBehavior.Popover on the MasterDetailPage to force it to exhibit the behaviour you are after, otherwise it will default to MasterBehavior.Default, which in Landscape mode will be always open.
Related
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);
My scenario is, I have a Tabbed page in Xamarin Forms:
public partial class MainPage : TabbedPage
{
public MainPage()
{
InitializeComponent();
var playPage = new NavigationPage(new PlayPage())
{
Title = "Play",
Icon = "play.png"
};
var settingsPage = new NavigationPage(new SettingsPage())
{
Title = "Settings",
Icon = "settings.png"
};
var favoritesPage = new NavigationPage(new FavoritesPage())
{
Title = "Favorites",
Icon = "fave.png"
};
var aboutPage = new NavigationPage(new AboutPage())
{
Title = "About",
Icon = "info.png"
};
Children.Add(playPage);
Children.Add(favoritesPage);
Children.Add(settingsPage);
Children.Add(aboutPage);
}
}
I want to add a pause and play function to my app. On start up, the PlayPage would initially have the play.png icon and when I click on the PlayPage again it would change the icon to pause.png. Page is not changing just the page icon. Anyone has any idea how this could be done?
Edit:
So I have created a custom renderer, in OnElementChanged I utilize the ViewControllerSelected:
var tabbarController = (UITabBarController)this.ViewController;
if (null != tabbarController)
{
tabbarController.ViewControllerSelected += OnTabBarReselected;
}
And my OnTabBarReselected I have:
private void OnTabBarReselected(object sender, UITabBarSelectionEventArgs e)
{
switch (TabBar.SelectedItem.Title)
{
case "Play":
TabBar.SelectedItem.Title = "Pause";
TabBar.SelectedItem.Image = UIImage.FromFile("pause.png");
break;
}
}
This only does half of the work. It changes the Title of the selected tab bar from Play to Pause after I click on the same tab but not the Icon. The icon remains "play.png" until I get out of that tab page (selecting another tab). Anyone has any idea why?
You will need to implement a custom renderer to pull this off. There are some implementations on James Montemagno's blog where he talks about changing the icons.
iOS:
http://motzcod.es/post/138225183932/tintcolor-selectedimage-xamarin-forms-ios
Droid:
http://motzcod.es/post/157544468267/xamarin-forms-android-selected-and-unselected-tab-colors
This is however not necessarily related to your requirement of tapping the icon and changing that specific icon since all this code only runs when the page initially loads. It could be a nice starting point though. Check in there if there's a property on TabbedPage that changes when you tap on the current tab and change the icon at that point.
You also have a OnCurrentPageChanged event you can override in TabbedPage, but that isn't called when the page is already active.
I'm trying to adapt my app for iOS 7. It's written with Xamarin and C#.
I'm having trouble with extra padding for the left button in the navigationbar.
I have a helper method for rendering my back-button which looks like this:
public static UIBarButtonItem GetBackButton (this UIViewController controller)
{
var backImage = new UIImage ("Images/back.png");
var backButton = new UIButton (UIButtonType.Custom);
backButton.Frame = new RectangleF (0, 0, 44, 44);
backButton.SetImage (backImage, UIControlState.Normal);
backButton.TouchUpInside += (object sender, EventArgs e) => {
var cancelBackNavigation = false;
if (controller is UIViewControllerBase) {
if (((UIViewControllerBase)controller).PrepareNavigateBack () != true) {
cancelBackNavigation = true;
}
}
if (cancelBackNavigation == false) {
controller.NavigationController.PopViewControllerAnimated (true);
}
};
return new UIBarButtonItem (backButton);
}
The navigationbar adds lots of padding before the back-button and making the image inside the back-button look very far away from its real position. The code above works fine in iOS 6.
I don't wanna use ContentEdgeInsets cause it will stretch the image and making it ugly.
Anyone with an idea of what to do?
I tried looking up your issue and found out that first, you need to hide the back button as follows:
NavigationItem.HidesBackButton = true;
Then for setting the button, you need to set it this way:
NavigationItem.BackBarButtonItem = yourButton;
That way, you won`t have the extra indentation.
Also you might find the following question useful:
Make a custom back button for UINavigationController
This is how I setup my NavigationBar
controller.View.BackgroundColor = Theme.BackgroundColor;
controller.NavigationItem.SetHidesBackButton (true, false);
controller.NavigationController.Toolbar.TintColor = Theme.BackgroundColor;
controller.NavigationController.NavigationBar.TintColor = Theme.BackgroundColor;
controller.NavigationController.SetNavigationBarHidden (show == false, false);
controller.NavigationController.NavigationBar.BackgroundColor = Theme.BackgroundColor;
controller.NavigationController.NavigationBar.SetTitleTextAttributes (Theme.NavigationBarTextAttributes);
controller.NavigationController.NavigationBar.Subviews [0].Alpha = 0.01f;
I am trying to convert my Windows Form program into a WPF program in order to get images in my NotifyIcon systemtray icon. I am having issues converting it though. My current program has a tabcontrol1 and it uses the function: TabPages and DrawItem. WPF does not have these functions, but instead of TabPages it has Items, but I do not know what to change "DrawItem" to for WPF.
The reason why I am using "DrawItem" in my Windows Form is to change the color of the Tab text.
Changing from:
if (!find<T>(p.Value))
{
T myPage = new T();
myPage.Text = "Ping";
this.FormstabControl.TabPages.Add(myPage);
this.FormstabControl.DrawItem += new DrawItemEventHandler(ListBox1_DrawItem);
myPage.DataGridView.DataSource = p.Result;
}
To:
if (!find<T>(p.Value))
{
T myPage = new T();
myPage.Text = "Ping";
this.WPFtabControl.Items.Add(myPage);
//this.WPFtabControl.DrawItem += new DrawItemEventHandler(ListBox1_DrawItem);
myPage.DataGridView.DataSource = p.Result;
}
I had to comment out DrawItem because I do not know what to use instead. Also, type "T" is of type "TabPages" not Item. Below is the Find function that checks to see if the Tab already exists in the tabcontrol. When I declare myPage of type T, it setsup the DataGridView from within a different class (same as where T is defined.) I tried to fix it by throwing the WPF TabControl1 into a Windows.Form TabControl2, then searching through that tabcontrol's tabpages instead of passing a WPF Tabcontrol Item.
private bool find<T>()
{
bool found = false;
System.Windows.Forms.TabControl FormstabControl= new System.Windows.Forms.TabControl();
FormstabControl.TabPages.Add(this.WPFtabControl.Items.ToString());
foreach (TabPage page in FormstabControl.TabPages)
{
if (page is T)
{
found = true;
break;
}
}
return found;
}
private bool find<T>(string text) where T : TabPage
{
bool found = false;
System.Windows.Forms.TabControl FormstabControl= new System.Windows.Forms.TabControl();
FormstabControl.TabPages.Add(this.WPFtabControl.Items.ToString());
foreach (TabPage page in FormstabControl.TabPages)
{
if (page is T && text.Equals(page.Text))
{
found = true;
break;
}
}
return found;
}
When I run this app and the adjacent function, it runs and completes and adds a BLANK text tab, but returns no data to the datagrid within the TabControl. I do not know what is wrong.
How can I incorporate images in my NotifyIcon? I incorporate it like this:
this.notifyIcon.ContextMenu = new ContextMenu();
this.notifyIcon.ContextMenu.MenuItems.Add(new MenuItem("Hide", new EventHandler(hideApp)));
this.notifyIcon.ContextMenu.MenuItems.Add(new MenuItem("Show", new EventHandler(showApp)));
this.notifyIcon.ContextMenu.MenuItems.Add(new MenuItem("Exit", new EventHandler(exitApp)));
I'm trying to create a DevEx drop down button. Unfortunately, I'm running into two problems I can't figure out:
1) I can't get the popup menu to skin correctly, i.e. it doesn't skin as "Office 2010 Blue". The code I'm using is shown below:
private void InitializeSendToPricingSheetButton()
{
var barManager = new BarManager();
if (barManager.Controller == null) barManager.Controller = new BarAndDockingController();
barManager.Controller.PaintStyleName = "Skin";
barManager.Controller.LookAndFeel.UseDefaultLookAndFeel = false;
barManager.Controller.LookAndFeel.SkinName = "Office 2010 Blue";
barManager.ItemClick += HandleSendToPricingSheetClick;
barManager.Items.AddRange(new[] { new BarButtonItem(barManager, "Foo"), new BarButtonItem(barManager, "Bar"), new BarButtonItem(barManager, "Baz") });
var popupMenu = new PopupMenu { Manager = barManager };
foreach (var barItem in barManager.Items) popupMenu.ItemLinks.Add((BarItem)barItem);
popupMenu.ItemLinks[1].BeginGroup = true;
dropDownButtonSendToPricingSheet.DropDownControl = popupMenu;
}
2) This button is on a form. If the form loses focus (e.g. I click on Firefox), the pop-up menu still remains on-top. It won't go away until clicked.
Any suggestions would be much appreciated. Thanks for helping me deal with DevEx insanity.
I have solution to your second question.
You should add drop down button event handler as below:
dropDownButton1.LostFocus += new EventHandler(HidePopUp);
Handler method should be as below:
private void HidePopUp(object sender,object e)
{
dropDownButton1.HideDropDown();
}
For your second question, you should assign value to the bar manager property as:
BarManager manager = new BarManager();
manager.Form = this; // refers to current form
Find below link for reference
https://www.devexpress.com/Support/Center/Question/Details/Q274641
It is probably simpler to use DefaultLookAndFeel
Add this comp to your form and set the theme you'd like to use.
There is no need to set the theme for individual components.
defaultLookAndFeel1.LookAndFeel.SetSkinStyle("Office 2010 Blue");