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POModifying the Android seekbar widget to operate vertically
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  1. POModifying the Android seekbar widget to operate vertically
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    copied!<p>I'm trying to get a vertical seekbar going with the emulator, but I'm sort of stuck. I can get the seekbar to display the way I want it to, and I can get the progress to do what I want, and I can modify the onTouchEvent to get the thumb to go vertically instead of horizontally. What I can't do is get the thumb to move outside of the default 29 horizontal pixels without using setThumbOffset(). This in itself isn't a problem. The problem is coming from the fact that I don't understand the thumbOffset at all -- I guess. I think I could (properly) resize the widget, which I am pretty sure I'm not doing right. Or maybe I could just use the thumbOffset if I could figure it out. Since I can calculate the progress correctly I thought I would just use a linear function of progress * (getTop() - getBottom()) of the widget but that doesn't seem to do it. But I can't figure out what the offset is centered around.</p> <p>As a somewhat aside, I am really unsure if what I am doing in onSizeChanged() is sane or if it's going to bite me in the ass later on.</p> <p>Here's the main.xml layout:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;com.mobilsemantic.mobipoll.SlideBar android:id="@+id/slide" android:layout_width="wrap_content" android:layout_height="fill_parent" android:max="100" android:progress="0" android:secondaryProgress="25" /&gt; &lt;Button android:id="@+id/button" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="Hello, I am a Button" /&gt; &lt;TextView android:id="@+id/tracking" android:layout_width="fill_parent" android:layout_height="wrap_content" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>And the class (ignore the debugging junk):</p> <pre><code>import android.content.Context; import android.graphics.Canvas; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.widget.SeekBar; public class SlideBar extends SeekBar { private int oHeight = 320, oWidth = 29; private int oProgress = -1, oOffset = -1;; private float xPos = -1, yPos = -1; private int top = -1, bottom = -1, left = -1, right = -1; public SlideBar(Context context) { super(context); } public SlideBar(Context context, AttributeSet attrs) { super(context, attrs); oOffset = this.getThumbOffset(); oProgress = this.getProgress(); } public SlideBar(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } protected synchronized void onMeasure(int widthMeasureSpec, intheightMeasureSpec) { int height = View.MeasureSpec.getSize(heightMeasureSpec); oHeight = height; this.setMeasuredDimension(oWidth, oHeight); } protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(h, w, oldw, oldh); } protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); left = l; right = r; top = t; bottom = b; } protected void onDraw(Canvas c) { c.rotate(90); c.translate(0,-29); super.onDraw(c); } public boolean onTouchEvent(MotionEvent event) { xPos = event.getX(); yPos = event.getY(); float progress = (yPos-this.getTop())/(this.getBottom()-this.getTop()); oOffset = this.getThumbOffset(); oProgress = this.getProgress(); Log.d("offset" + System.nanoTime(), new Integer(oOffset).toString()); Log.d("progress" + System.nanoTime(), new Integer(oProgress).toString()); float offset; offset = progress * (this.getBottom()-this.getTop()); this.setThumbOffset((int)offset); Log.d("offset_postsetprogress" + System.nanoTime(), new Integer(oOffset).toString()); Log.d("progress_postsetprogress" + System.nanoTime(), new Integer(oProgress).toString()); this.setProgress((int)(100*event.getY()/this.getBottom())); return true; } } </code></pre>
 

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