From e1867a88b6aa53cc1adf63c95960ee02c81fc2ff Mon Sep 17 00:00:00 2001 From: Soren Stoutner Date: Mon, 7 Nov 2016 12:29:35 -0700 Subject: [PATCH] Disable `Back` and `Forward` in the navigation menu if they are not available. Fixes https://redmine.stoutner.com/issues/20 --- .../privacybrowser/MainWebViewActivity.java | 29 ++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/app/src/main/java/com/stoutner/privacybrowser/MainWebViewActivity.java b/app/src/main/java/com/stoutner/privacybrowser/MainWebViewActivity.java index 1c20c46d..25b70df8 100644 --- a/app/src/main/java/com/stoutner/privacybrowser/MainWebViewActivity.java +++ b/app/src/main/java/com/stoutner/privacybrowser/MainWebViewActivity.java @@ -283,13 +283,40 @@ public class MainWebViewActivity extends AppCompatActivity implements Navigation // Create the navigation drawer. drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); - // The DrawerTitle identifies the drawer in accessibility mode. + // The `DrawerTitle` identifies the drawer in accessibility mode. drawerLayout.setDrawerTitle(GravityCompat.START, getString(R.string.navigation_drawer)); // Listen for touches on the navigation menu. final NavigationView navigationView = (NavigationView) findViewById(R.id.navigationView); navigationView.setNavigationItemSelectedListener(this); + // Get handles for `navigationMenu` and the back and forward menu items. The menu is zero-based, so item 1 and 2 and the second and third items in the menu. + final Menu navigationMenu = navigationView.getMenu(); + final MenuItem navigationBackMenuItem = navigationMenu.getItem(1); + final MenuItem navigationForwardMenuItem = navigationMenu.getItem(2); + + // The `DrawerListener` allows us to update the Navigation Menu. + drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() { + @Override + public void onDrawerSlide(View drawerView, float slideOffset) { + } + + @Override + public void onDrawerOpened(View drawerView) { + } + + @Override + public void onDrawerClosed(View drawerView) { + } + + @Override + public void onDrawerStateChanged(int newState) { + // Update the back and forward menu items every time the drawer opens. + navigationBackMenuItem.setEnabled(mainWebView.canGoBack()); + navigationForwardMenuItem.setEnabled(mainWebView.canGoForward()); + } + }); + // drawerToggle creates the hamburger icon at the start of the AppBar. drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, supportAppBar, R.string.open_navigation, R.string.close_navigation); -- 2.43.0