Scenario:
https://www.b4x.com/android/forum/threads/disable-autorotate-on-a-single-view.80699/#post-511594
But this doesn't give the "snap back" capability - if you are in landscape when you exit the "rotatable" page that is the orientation you will stay in.
The following is a variation on the above post which gives the "snap back" capability - with a bit of assistance from the user - the dirty bit.
In your Main module:
In your "rotatable" page (this is an excerpt from my Webview code):
Everything hangs on the global boolean Gen_autorotate:
- You have an essentially portrait-only app.
- You want to give the user the ability (i.e. option), on certain pages, to change from portrait to landscape or vice versa by rotating the phone - typically for displaying videos or webpages.
- When the user exits the "rotatable" page you want to "snap back" to portrait.
https://www.b4x.com/android/forum/threads/disable-autorotate-on-a-single-view.80699/#post-511594
But this doesn't give the "snap back" capability - if you are in landscape when you exit the "rotatable" page that is the orientation you will stay in.
The following is a variation on the above post which gives the "snap back" capability - with a bit of assistance from the user - the dirty bit.
In your Main module:
B4X:
#iPhoneOrientations: Portrait, LandscapeLeft, LandscapeRight
...
...
...
Private Sub Process_Globals
...
Public Gen_autorotate As Boolean
...
End Sub
...
...
...
Public Sub Main_ShouldAutoRotate As Boolean
'If auto rotation allowed...
If Gen_autorotate Then
'Return True to OBJC code below, allowing auto rotation
Return True
'Otherwise, auto rotation to stop...
Else
'If still in landscape orientation...
If GetDeviceLayoutValues.Width > GetDeviceLayoutValues.Height Then
'Return True to OBJC code below, to continue allowing auto rotation
'and wait for user to reorient to portrait
Return True
End If
'If got to here must be in portrait orientation and auto rotation not
'allowed
'Return False to OBJC code below, disallowing auto rotation
Return False
End If
End Sub
#if OBJC
@end
@interface UINavigationController (B4IResize)
@end
@implementation UINavigationController (B4IResize)
- (BOOL)shouldAutorotate
{
return [(NSNumber*)[B4IObjectWrapper raiseEvent:self :@"_shouldautorotate" :nil] boolValue];
}
#End IfIn your "rotatable" page (this is an excerpt from my Webview code):
B4X:
Private Sub Event_Webview_page_Resize(Width As Int, Height As Int)
'Clean up
Webview_page.RootPanel.RemoveAllViews
'Set up app background
Webview_page.RootPanel.Color = Colors.White
'UI_webview is defined and initialized in webviewlayout
Webview_page.RootPanel.LoadLayout("webviewlayout")
'Set up UI_webview custom view
UI_webview.BaseView.Top = 0
UI_webview.BaseView.Left = 0
UI_webview.BaseView.Width = Webview_page.RootPanel.Width
UI_webview.BaseView.Height = Webview_page.RootPanel.Height
'Flag auto rotation allowed
Main.Gen_autorotate = True
'Load web page
UI_webview.LoadUrl(Main.Gen_webview_url)
'Set up navigation back
UI_navigation_back.Initialize("Event_back")
Webview_page.RootPanel.AddView(UI_navigation_back, 0, 0, Webview_page.RootPanel.Width, Webview_page.RootPanel.Height)
UI_navigation_back.Text = "< Back "
UI_navigation_back.TextAlignment = UI_navigation_back.ALIGNMENT_LEFT
UI_navigation_back.Font = Font.CreateNew2(Main.App_preference_general_typeface_normal, .03 * Max(Webview_page.RootPanel.Height, Webview_page.RootPanel.Width))
UI_navigation_back.Color = Colors.white
UI_navigation_back.TextColor = Colors.Black
UI_navigation_back.Visible = True
UI_navigation_back.SizeToFit
End Sub
Private Sub Event_back_Click
'Flag auto rotate to stop
Main.Gen_autorotate = False
'Clean up
Webview_page.RootPanel.RemoveAllViews
'Show status bar, see:
'https://www.b4x.com/android/forum/threads/full-screen-apps.47866/#content
Private wrk_no As NativeObject = Main.App
wrk_no.RunMethod("setStatusBarHidden:animated:", Array(False, False))
'Return to previous page
Main.NavControl.RemoveCurrentPage2(False)
End SubEverything hangs on the global boolean Gen_autorotate:
- When the Webview code is entered it is set to True, which allows the subsequent rotation of the phone by the user to rotate the orientation at will.
- When the Webview code is exited it is set to False, which allows subsequent rotation of the phone by the user to rotate the orientation - UNTIL the user rotates to portrait mode, then autorotation is blocked - and portrait mode has been "snapped" back to - sort of.
- Make everything autorotatable.
- Make nothing autorotatable.
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