add easier font size selection dialog

bump version

AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.fox.ttrss"
-    android:versionCode="224"
-    android:versionName="1.28" >
+    android:versionCode="225"
+    android:versionName="1.29" >
 
     <uses-sdk
         android:minSdkVersion="8"

res/layout/select_font_size_dialog.xml

@@ -0,0 +1,22 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/text_progress"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="6dip"
+        android:gravity="center_horizontal" >
+    </TextView>
+
+    <SeekBar
+        android:id="@+id/seek_bar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="6dip"
+        android:layout_marginTop="6dip" />
+
+</LinearLayout>

res/values/strings.xml

@@ -211,4 +211,5 @@
     <string name="synchronize_read_articles_and_go_online">Synchronize read articles and go online</string>
     <string name="prefs_compatible_article_layout">Compatible article layout</string>
     <string name="prefs_compatible_layout_summary">Enable if you see glitches in article content</string>
+    <string name="font_size_dialog_suffix">sp</string>
 </resources>

res/xml/preferences.xml

@@ -103,14 +103,15 @@
             android:summary="@string/pref_headlines_mark_read_scroll_long"
             android:title="@string/pref_headlines_mark_read_scroll" />
 
-        <EditTextPreference
+         <org.fox.ttrss.util.FontSizeDialogPreference
 			android:defaultValue="13"
 			android:key="headlines_font_size_sp"
-            android:inputType="number"
+			android:dialogMessage="@string/pref_headline_font_size"
 			android:title="@string/pref_headline_font_size" />
+
          </PreferenceCategory>
     <PreferenceCategory android:title="@string/reading" >
-        <EditTextPreference
+        <org.fox.ttrss.util.FontSizeDialogPreference
             android:defaultValue="16"
             android:key="article_font_size_sp"
             android:inputType="number"

src/org/fox/ttrss/util/FontSizeDialogPreference.java

@@ -0,0 +1,224 @@
+package org.fox.ttrss.util;
+
+// http://www.lukehorvat.com/blog/android-seekbardialogpreference/
+
+import org.fox.ttrss.R;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.preference.DialogPreference;
+import android.util.AttributeSet;
+import android.util.TypedValue;
+import android.view.View;
+import android.widget.SeekBar;
+import android.widget.SeekBar.OnSeekBarChangeListener;
+import android.widget.TextView;
+
+/**
+ * A {@link DialogPreference} that provides a user with the means to select an
+ * integer from a {@link SeekBar}, and persist it.
+ * 
+ * @author lukehorvat
+ * 
+ */
+public class FontSizeDialogPreference extends DialogPreference {
+	private static final int DEFAULT_MIN_PROGRESS = 9;
+	private static final int DEFAULT_MAX_PROGRESS = 24;
+	private static final String DEFAULT_PROGRESS = "0";
+
+	private int mMinProgress = DEFAULT_MIN_PROGRESS;
+	private int mMaxProgress = DEFAULT_MAX_PROGRESS;
+	private int mProgress;
+	private CharSequence mProgressTextSuffix;
+	private TextView mProgressText;
+	private SeekBar mSeekBar;
+
+	public FontSizeDialogPreference(Context context) {
+		this(context, null);
+	}
+
+	public FontSizeDialogPreference(Context context, AttributeSet attrs) {
+		super(context, attrs);
+
+		setProgressTextSuffix(" " + context.getString(R.string.font_size_dialog_suffix));
+		
+		// set layout
+		setDialogLayoutResource(R.layout.select_font_size_dialog);
+		setPositiveButtonText(android.R.string.ok);
+		setNegativeButtonText(android.R.string.cancel);
+		setDialogIcon(null);
+	}
+
+	@Override
+	protected void onSetInitialValue(boolean restore, Object defaultValue) {
+		setProgress(restore ? Integer.valueOf(getPersistedString(DEFAULT_PROGRESS))
+				: Integer.valueOf((String)defaultValue));
+	}
+
+	@Override
+	protected Object onGetDefaultValue(TypedArray a, int index) {
+		return a.getString(index);
+	}
+
+	@Override
+	protected void onBindDialogView(View view) {
+		super.onBindDialogView(view);
+
+		mProgressText = (TextView) view.findViewById(R.id.text_progress);
+
+		mSeekBar = (SeekBar) view.findViewById(R.id.seek_bar);
+		mSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
+			@Override
+			public void onStopTrackingTouch(SeekBar seekBar) {
+			}
+
+			@Override
+			public void onStartTrackingTouch(SeekBar seekBar) {
+			}
+
+			@Override
+			public void onProgressChanged(SeekBar seekBar, int progress,
+					boolean fromUser) {
+				// update text that displays the current SeekBar progress value
+				// note: this does not persist the progress value. that is only
+				// ever done in setProgress()
+				String progressStr = String.valueOf(progress + mMinProgress);
+				mProgressText.setText(mProgressTextSuffix == null ? progressStr
+						: progressStr.concat(mProgressTextSuffix.toString()));
+				mProgressText.setTextSize(TypedValue.COMPLEX_UNIT_SP, progress + mMinProgress);
+			}
+		});
+		
+		mSeekBar.setMax(mMaxProgress - mMinProgress);
+		mSeekBar.setProgress(mProgress - mMinProgress);
+	}
+
+	public int getMinProgress() {
+		return mMinProgress;
+	}
+
+	public void setMinProgress(int minProgress) {
+		mMinProgress = minProgress;
+		setProgress(Math.max(mProgress, mMinProgress));
+	}
+
+	public int getMaxProgress() {
+		return mMaxProgress;
+	}
+
+	public void setMaxProgress(int maxProgress) {
+		mMaxProgress = maxProgress;
+		setProgress(Math.min(mProgress, mMaxProgress));
+	}
+
+	public int getProgress() {
+		return mProgress;
+	}
+
+	public void setProgress(int progress) {
+		progress = Math.max(Math.min(progress, mMaxProgress), mMinProgress);
+
+		if (progress != mProgress) {
+			mProgress = progress;
+			persistString(String.valueOf(progress));
+			notifyChanged();
+		}
+	}
+
+	public CharSequence getProgressTextSuffix() {
+		return mProgressTextSuffix;
+	}
+
+	public void setProgressTextSuffix(CharSequence progressTextSuffix) {
+		mProgressTextSuffix = progressTextSuffix;
+	}
+
+	@Override
+	protected void onDialogClosed(boolean positiveResult) {
+		super.onDialogClosed(positiveResult);
+
+		// when the user selects "OK", persist the new value
+		if (positiveResult) {
+			int seekBarProgress = mSeekBar.getProgress() + mMinProgress;
+			if (callChangeListener(seekBarProgress)) {
+				setProgress(seekBarProgress);
+			}
+		}
+	}
+
+	@Override
+	protected Parcelable onSaveInstanceState() {
+		// save the instance state so that it will survive screen orientation
+		// changes and other events that may temporarily destroy it
+		final Parcelable superState = super.onSaveInstanceState();
+
+		// set the state's value with the class member that holds current
+		// setting value
+		final SavedState myState = new SavedState(superState);
+		myState.minProgress = getMinProgress();
+		myState.maxProgress = getMaxProgress();
+		myState.progress = getProgress();
+
+		return myState;
+	}
+
+	@Override
+	protected void onRestoreInstanceState(Parcelable state) {
+		// check whether we saved the state in onSaveInstanceState()
+		if (state == null || !state.getClass().equals(SavedState.class)) {
+			// didn't save the state, so call superclass
+			super.onRestoreInstanceState(state);
+			return;
+		}
+
+		// restore the state
+		SavedState myState = (SavedState) state;
+		setMinProgress(myState.minProgress);
+		setMaxProgress(myState.maxProgress);
+		setProgress(myState.progress);
+
+		super.onRestoreInstanceState(myState.getSuperState());
+	}
+
+	private static class SavedState extends BaseSavedState {
+		int minProgress;
+		int maxProgress;
+		int progress;
+
+		public SavedState(Parcelable superState) {
+			super(superState);
+		}
+
+		public SavedState(Parcel source) {
+			super(source);
+
+			minProgress = source.readInt();
+			maxProgress = source.readInt();
+			progress = source.readInt();
+		}
+
+		@Override
+		public void writeToParcel(Parcel dest, int flags) {
+			super.writeToParcel(dest, flags);
+
+			dest.writeInt(minProgress);
+			dest.writeInt(maxProgress);
+			dest.writeInt(progress);
+		}
+
+		@SuppressWarnings("unused")
+		public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
+			@Override
+			public SavedState createFromParcel(Parcel in) {
+				return new SavedState(in);
+			}
+
+			@Override
+			public SavedState[] newArray(int size) {
+				return new SavedState[size];
+			}
+		};
+	}
+}