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Make search faster (use a non-constant step)

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serso 2016-02-07 13:35:51 +01:00
parent 8bd412a315
commit c528d181db
1 changed files with 14 additions and 2 deletions
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16
app/src/main/java/org/solovyev/android/views/AutoResizeTextView.java
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@ -19,6 +19,7 @@ import android.text.Layout.Alignment;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.TimingLogger;
import android.util.TypedValue;
import android.widget.TextView;
@ -40,6 +41,7 @@ public class AutoResizeTextView extends TextView {
public static final float MIN_TEXT_SIZE = 20;
// Our ellipse string
private static final String mEllipsis = "…";
private static final String TAG = "AutoResizeTextView";
// Registered resize listener
private OnTextResizeListener mTextResizeListener;
// Flag for text and/or size changes to force a resize
@ -58,6 +60,7 @@ public class AutoResizeTextView extends TextView {
private boolean mAddEllipsis = true;
private final TextPaint tmpPaint = new TextPaint();
private final float mStep;
private final TimingLogger mTimer = new TimingLogger(TAG, "");
// Default constructor override
public AutoResizeTextView(Context context) {
@ -221,6 +224,7 @@ public class AutoResizeTextView extends TextView {
* Resize the text size with specified width and height
*/
public void resizeText(int width, int height) {
mTimer.reset(TAG, "resizeText");
CharSequence text = getText();
// Do not resize if the view does not have dimensions or there is no text
if (text == null || text.length() == 0 || height <= 0 || width <= 0 || mTextSize == 0) {
@ -242,10 +246,13 @@ public class AutoResizeTextView extends TextView {
// Get the required text height
int textHeight = getTextHeight(text, textPaint, width, targetTextSize);
mTimer.addSplit("beforeScaling");
if (textHeight > height && targetTextSize > mMinTextSize) {
// Until we either fit within our text view or we had reached our min text size, incrementally try smaller sizes
while (textHeight > height && targetTextSize > mMinTextSize) {
targetTextSize = Math.max(targetTextSize - mStep, mMinTextSize);
// to make search faster let's use "textHeight / height" factor for the step (it is always > 1)
final float factor = textHeight / height;
targetTextSize = Math.max((float)Math.floor(targetTextSize - mStep * factor), mMinTextSize);
textHeight = getTextHeight(text, textPaint, width, targetTextSize);
}
} else if (textHeight < height) {
@ -257,10 +264,13 @@ public class AutoResizeTextView extends TextView {
targetTextSize = newTargetTextSize;
textHeight = newTextHeight;
newTargetTextSize += mStep;
// to make search faster let's use "height / newTextHeight" factor for the step (it is always > 1)
final float factor = height / newTextHeight;
newTargetTextSize = (float) Math.floor(newTargetTextSize + mStep * factor);
newTextHeight = getTextHeight(text, textPaint, width, newTargetTextSize);
}
}
mTimer.addSplit("scaling");
// If we had reached our minimum text size and still don't fit, append an ellipsis
if (mAddEllipsis && targetTextSize == mMinTextSize && textHeight > height) {
@ -293,6 +303,7 @@ public class AutoResizeTextView extends TextView {
}
}
}
mTimer.addSplit("ellipsising");
// Some devices try to auto adjust line spacing, so force default line spacing
// and invalidate the layout as a side effect
@ -306,6 +317,7 @@ public class AutoResizeTextView extends TextView {
// Reset force resize flag
mNeedsResize = false;
mTimer.dumpToLog();
}
// Set the text size of the text paint object and use a static layout to render text off screen before measuring