extract generic LoaderFragment superclass from KeyList

1 files changed, 78 insertions, 0 deletions

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/LoaderFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/LoaderFragment.java
new file mode 100644
index 000000000..87ab1bb8c
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/LoaderFragment.java
@@ -0,0 +1,78 @@
+package org.sufficientlysecure.keychain.ui;
+
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.animation.AnimationUtils;
+
+import org.sufficientlysecure.keychain.R;
+
+/** This is a fragment helper class, which implements a generic
+ * progressbar/container view.
+ *
+ * To use it in a fragment, simply subclass, use onCreateView to create the
+ * layout's root view, and ues getContainer() as root view of your subclass.
+ * The layout shows a progress bar by default, and can be switched to the
+ * actual contents by calling setContentShown().
+ * 
+ */
+public class LoaderFragment extends Fragment {
+    private boolean mContentShown;
+    private View mProgressContainer;
+    private ViewGroup mContainer;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        View root = inflater.inflate(R.layout.loader_layout, container, false);
+
+        mContentShown = true;
+        mContainer = (ViewGroup) root.findViewById(R.id.loader_container);
+        mProgressContainer = root.findViewById(R.id.loader_progress);
+
+        // content is not shown (by visibility statuses in the layout files)
+        mContentShown = false;
+
+        return root;
+
+    }
+
+    protected ViewGroup getContainer() {
+        return mContainer;
+    }
+
+    public void setContentShown(boolean shown, boolean animate) {
+        if (mContentShown == shown) {
+            return;
+        }
+        mContentShown = shown;
+        if (shown) {
+            if (animate) {
+                mProgressContainer.startAnimation(AnimationUtils.loadAnimation(
+                        getActivity(), android.R.anim.fade_out));
+                mContainer.startAnimation(AnimationUtils.loadAnimation(
+                        getActivity(), android.R.anim.fade_in));
+            }
+            mProgressContainer.setVisibility(View.GONE);
+            mContainer.setVisibility(View.VISIBLE);
+        } else {
+            if (animate) {
+                mProgressContainer.startAnimation(AnimationUtils.loadAnimation(
+                        getActivity(), android.R.anim.fade_in));
+                mContainer.startAnimation(AnimationUtils.loadAnimation(
+                        getActivity(), android.R.anim.fade_out));
+            }
+            mProgressContainer.setVisibility(View.VISIBLE);
+            mContainer.setVisibility(View.INVISIBLE);
+        }
+    }
+
+    public void setContentShown(boolean shown) {
+        setContentShown(shown, true);
+    }
+
+    public void setContentShownNoAnimation(boolean shown) {
+        setContentShown(shown, false);
+    }
+}