[mono-android] How to implement ViewPager from compatibility package .jar
Gerry High
ghigh at hightg.com
Sun Feb 12 02:16:34 UTC 2012
Stuart,
Have you made any more changes to this code? Also, do you have a photo of how this looks? I'm thinking of adding a pager control to my app--I use a UIPagerController in my iPhone version and am looking for something like the UIPagerControl (http://books.google.com/books?id=lFe0EwHUREEC&pg=PA125&lpg=PA125&dq=uipagercontrol&source=bl&ots=-SNjmXH5Z3&sig=Aa0tUicP1yWkcJ0cA8i8STg6_3w&hl=en&sa=X&ei=2yA3T8WzA8mEsALg-fSiAg&ved=0CC8Q6AEwAg#v=onepage&q=uipagercontrol&f=false)
Thanks,
Gerry
On Feb 4, 2012, at 2:33 PM, Stuart Lodge wrote:
> If it helps I've also just ported a Page Indicator from the Java sample on this blog: http://buildmobile.com/how-to-build-an-android-pager-component/#fbid=TnZmgHdBfhF (license unclear?)
>
> Still some sizing issues to sort out - and it would be nice to make it more "animated" - but it basically works
>
> Stuart
> using System;
> using Android.Content;
> using Android.Graphics;
> using Android.Util;
> using Android.Views;
>
> namespace SocialStorm.Android.Controls
> {
> public class HorizontalPagerIndicator : View
> {
> private HorizontalPager _pager;
> private Paint _textPaint;
> private Paint _dotPaint;
> private int _textHeight;
> private int _ascent;
> private int _cellSize;
>
> public HorizontalPagerIndicator(Context context, IAttributeSet attrs)
> : base(context, attrs)
> {
> InitPaints();
> }
>
>
> public HorizontalPagerIndicator(Context context)
> : base(context)
> {
> InitPaints();
> }
>
> private void InitPaints()
> {
> _textPaint = new Paint {AntiAlias = true, TextSize = 10, Color = Color.Black};
>
> _dotPaint = new Paint {AntiAlias = true, Color = Color.Gray};
>
> _ascent = -(int)_textPaint.Ascent();
> _textHeight = (int)(_ascent + _textPaint.Descent());
> _cellSize = _textHeight + 6;
> }
>
>
> public HorizontalPager Pager
> {
> get { return _pager; }
> set
> {
>
> if (_pager != null)
> {
> _pager.ScreenChanged -= PagerOnScreenChanged;
> }
> _pager = value;
> if (_pager != null)
> {
> _pager.ScreenChanged += PagerOnScreenChanged;
> }
> UpdatePageCount();
> }
> }
>
> private void PagerOnScreenChanged(object sender, EventArgs eventArgs)
> {
> Invalidate();
> }
>
> public void UpdatePageCount()
> {
> RequestLayout();
> Invalidate();
> }
>
> private int NumPages
> {
> get
> {
> return _pager == null ? 1 : _pager.ChildCount;
> }
> }
>
> private int ActivePage
> {
> get
> {
> return _pager == null ? 0 : _pager.CurrentScreen;
> }
> }
>
>
> protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
> {
> SetMeasuredDimension(MeasureWidth(widthMeasureSpec), MeasureHeight(heightMeasureSpec));
> }
>
> private int MeasureWidth(int measureSpec)
> {
> var result = 0;
> var specMode = MeasureSpec.GetMode(measureSpec);
> var specSize = MeasureSpec.GetSize(measureSpec);
>
> if (specMode == MeasureSpecMode.Exactly)
> {
> // We were told how big to be
> result = specSize;
> }
> else
> {
> result = NumPages * _cellSize;
> if (specMode == MeasureSpecMode.AtMost)
> {
> // Respect AT_MOST value if that was what is called for by
> // measureSpec
> result = Math.Min(result, specSize);
> }
> }
> return result;
> }
>
> private int MeasureHeight(int measureSpec)
> {
> var result = 0;
> var specMode = MeasureSpec.GetMode(measureSpec);
> var specSize = MeasureSpec.GetSize(measureSpec);
>
>
> if (specMode == MeasureSpecMode.Exactly)
> {
> // We were told how big to be
> result = specSize;
> }
> else
> {
> result = _cellSize;
> if (specMode == MeasureSpecMode.AtMost)
> {
> // Respect AT_MOST value if that was what is called for by
> // measureSpec
> result = Math.Min(result, specSize);
> }
> }
> return result;
> }
>
> protected override void OnDraw(Canvas canvas)
> {
> base.OnDraw(canvas);
>
> var count = NumPages;
> var current = ActivePage;
>
> int x = 0;
> for (int i = 0; i < count; i++, x += _cellSize)
> {
> if (i == current)
> {
> String txt = (i + 1).ToString();
> var bounds = new Rect();
> _textPaint.GetTextBounds(txt, 0, txt.Length, bounds);
> var oval = new RectF(x + 1, 1, x + _cellSize - 2, _cellSize - 2);
> canvas.DrawOval(oval, _dotPaint);
> canvas.DrawText(txt, x + (_cellSize - bounds.Width()) / 2, (_cellSize - _textHeight) / 2 + _ascent, _textPaint);
> }
> else
> {
> const int dotSize = 5;
> var dotOffset = (_cellSize - dotSize) / 2;
> var oval = new RectF(x + dotOffset, dotOffset, x + dotOffset + dotSize, dotOffset + dotSize);
> canvas.DrawOval(oval, _dotPaint);
> }
> }
> }
>
> }
> }
>
> On 25 January 2012 21:20, Tomasz Cielecki <tomasz at ostebaronen.dk> wrote:
> Do what you want as long as it does not violate the License :)
>
> On Wed, Jan 25, 2012 at 8:47 PM, Miljenko Cvjetko
> <mcvjetko at holisticware.net> wrote:
> > Hi
> >
> > On 2012.01.25 14:12, Tomasz Cielecki wrote:
> >
> > I have made a port of a Horizontal Pager which can be found
> > here: https://github.com/Cheesebaron/MonoDroid.HorizontalPager
> >
> > Great job!
> > Thanks.
> >
> > may I put it together as VS item template?
> > ... and publish it of course ...
> >
> > regards
> >
> > mel
> >
> >
> > It works in a similar manner. This is an entirely C# implementation.
> >
> > On Jan 25, 2012 12:52 PM, "Stuart Lodge" <me at slodge.com> wrote:
> >>
> >> I don't suppose anyone has already done this and would like to share the
> >> source (just asking in case)
> >>
> >> If not, then I'll have a go... as I'd quite like to use the ViewPager in
> >> this app.
> >>
> >> On 23 January 2012 21:24, Jonathan Pryor <jonp at xamarin.com> wrote:
> >>>
> >>> On Jan 21, 2012, at 7:36 AM, k0ng wrote:
> >>> > I want to use ViewPager as demo in this website
> >>> >
> >>> > http://geekyouup.blogspot.com/2011/07/viewpager-example-from-paug.html
> >>>
> >>> Right now, it won't be easy, as you need to manually bind the Java types.
> >>>
> >>> In a future release, we'll be providing a tool to simplify the binding
> >>> process.
> >>>
> >>> If you really want to hand-bind them now, see:
> >>>
> >>> The base Java class:
> >>> https://github.com/xamarin/monodroid-samples/blob/master/SanityTests/Adder.java
> >>> The C# glue code for inheritance:
> >>> https://github.com/xamarin/monodroid-samples/blob/master/SanityTests/ManagedAdder.cs
> >>>
> >>> - Jon
> >>>
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> >>
> >>
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> >
> > --
> > Miljenko Cvjetko dipl.ing. ET
> > Direktor/CEO
> > Projektant rješenja/Solution Architect
> > Razvojni programer/Senior developer
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>
>
>
> --
> Med Venlig Hilsen / With Best Regards
> Tomasz Cielecki
> http://ostebaronen.dk
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