brightness adjustment experiments

src/org/geometerplus/fbreader/fbreader/FBView.java

@@ -90,6 +90,8 @@ public final class FBView extends ZLTextView {
 	private int myStartX;
 	private int myStartY;
 	private boolean myIsManualScrollingActive;
+	private boolean myIsBrightnessAdjustmentInProgress;
+	private int myStartBrightness;
 
 	public boolean onStylusPress(int x, int y) {
 		if (super.onStylusPress(x, y)) {
@@ -116,6 +118,14 @@ public final class FBView extends ZLTextView {
 			return true;
 		}
 
+		if (x < 20) {
+			myIsBrightnessAdjustmentInProgress = true;
+			myStartY = y;
+			myStartBrightness = ZLibrary.Instance().getScreenBrightness();
+			System.err.println("starting on level: " + myStartBrightness);
+			return true;
+		}
+
 		final ScrollingPreferences preferences = ScrollingPreferences.Instance();
 		if (preferences.FlickOption.getValue()) {
 			myStartX = x;
@@ -148,6 +158,18 @@ public final class FBView extends ZLTextView {
 		}
 
 		synchronized (this) {
+			if (myIsBrightnessAdjustmentInProgress) {
+				if (x >= 40) {
+					myIsBrightnessAdjustmentInProgress = false;
+				} else {
+					final int delta = (myStartBrightness + 10) * 2 * (myStartY - y) / myContext.getHeight();
+					System.err.println("adjusting to level: " + (myStartBrightness + delta));
+					ZLibrary.Instance().setScreenBrightness(myStartBrightness + delta);
+					System.err.println("adjusted to level: " + ZLibrary.Instance().getScreenBrightness());
+					return true;
+				}
+			}
+
 			if (isScrollingActive() && myIsManualScrollingActive) {
 				final boolean horizontal = ScrollingPreferences.Instance().HorizontalOption.getValue();
 				final int diff = horizontal ? x - myStartX : y - myStartY;
@@ -183,6 +205,9 @@ public final class FBView extends ZLTextView {
 		}
 
 		synchronized (this) {
+			if (myIsBrightnessAdjustmentInProgress) {
+				myIsBrightnessAdjustmentInProgress = false;
+			}
 			if (isScrollingActive() && myIsManualScrollingActive) {
 				setScrollingActive(false);
 				myIsManualScrollingActive = false;

src/org/geometerplus/zlibrary/core/library/ZLibrary.java

@@ -37,5 +37,7 @@ public abstract class ZLibrary {
 
 	abstract public String getVersionName();
 	abstract public String getCurrentTimeString();
+	abstract public void setScreenBrightness(int percent);
+	abstract public int getScreenBrightness();
 	abstract public void openInBrowser(String reference);
 }

src/org/geometerplus/zlibrary/ui/android/library/ZLAndroidActivity.java

@@ -60,6 +60,22 @@ public abstract class ZLAndroidActivity extends Activity {
 		}
 	}
 
+	final void setScreenBrightness(int percent) {
+		if (percent < 0) {
+			percent = 0;
+		} else if (percent > 100) {
+			percent = 100;
+		}
+		final WindowManager.LayoutParams attrs = getWindow().getAttributes();
+		attrs.screenBrightness = percent / 100.0f;
+		getWindow().setAttributes(attrs);
+	}
+
+	final int getScreenBrightness() {
+		final int level = (int)(100 * getWindow().getAttributes().screenBrightness);
+		return (level >= 0) ? level : 50;
+	}
+
 	@Override
 	public void onCreate(Bundle state) {
 		super.onCreate(state);

src/org/geometerplus/zlibrary/ui/android/library/ZLAndroidLibrary.java

@@ -110,10 +110,23 @@ public final class ZLAndroidLibrary extends ZLibrary {
 		}
 	}
 
+	@Override
 	public String getCurrentTimeString() {
 		return DateFormat.getTimeFormat(myApplication.getApplicationContext()).format(new Date());
 	}
 
+	@Override
+	public void setScreenBrightness(int percent) {
+		if (myActivity != null) {
+			myActivity.setScreenBrightness(percent);
+		}
+	}
+
+	@Override
+	public int getScreenBrightness() {
+		return (myActivity != null) ? myActivity.getScreenBrightness() : 0;
+	}
+
 	private final class AndroidResourceFile extends ZLResourceFile {
 		private boolean myExists;
 		private int myResourceId;