diff options
Diffstat (limited to 'imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerCore.kt')
| -rw-r--r-- | imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerCore.kt | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerCore.kt b/imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerCore.kt new file mode 100644 index 0000000..f197a5e --- /dev/null +++ b/imagepicker/src/main/kotlin/ca/allanwang/kau/imagepicker/ImagePickerCore.kt @@ -0,0 +1,200 @@ +package ca.allanwang.kau.imagepicker + +import android.Manifest +import android.app.Activity +import android.content.Context +import android.content.Intent +import android.database.Cursor +import android.graphics.Color +import android.graphics.drawable.Drawable +import android.os.Bundle +import android.provider.MediaStore +import android.support.v4.app.LoaderManager +import android.support.v4.content.CursorLoader +import android.support.v4.content.Loader +import android.support.v7.app.AppCompatActivity +import android.support.v7.widget.GridLayoutManager +import android.support.v7.widget.RecyclerView +import ca.allanwang.kau.animators.FadeScaleAnimatorAdd +import ca.allanwang.kau.animators.KauAnimator +import ca.allanwang.kau.permissions.kauRequestPermissions +import ca.allanwang.kau.utils.dimenPixelSize +import ca.allanwang.kau.utils.toast +import com.mikepenz.fastadapter.IItem +import com.mikepenz.fastadapter.commons.adapters.FastItemAdapter +import com.mikepenz.google_material_typeface_library.GoogleMaterial +import com.mikepenz.iconics.IconicsDrawable + +/** + * Created by Allan Wang on 2017-07-23. + * + * Container for the main logic behind the image pickers + */ +abstract class ImagePickerCore<T : IItem<*, *>> : AppCompatActivity(), LoaderManager.LoaderCallbacks<Cursor> { + + companion object { + /** + * Given the dimensions of our device and a minimum image size, + * Computer the optimal column count for our grid layout + * + * @return column count + */ + fun computeColumnCount(context: Context): Int { + val minImageSizePx = context.dimenPixelSize(R.dimen.kau_image_minimum_size) + val screenWidthPx = context.resources.displayMetrics.widthPixels + return screenWidthPx / minImageSizePx + } + + /** + * Compute our resulting image size + */ + fun computeViewSize(context: Context): Int { + val screenWidthPx = context.resources.displayMetrics.widthPixels + return screenWidthPx / computeColumnCount(context) + } + + /** + * Create error tile for a given item + */ + fun getErrorDrawable(context: Context): Drawable { + val sizePx = ImagePickerCore.computeViewSize(context) + return IconicsDrawable(context, GoogleMaterial.Icon.gmd_error) + .sizePx(sizePx) + .backgroundColor(accentColor) + .paddingPx(sizePx / 3) + .color(Color.WHITE) + } + + var accentColor: Int = 0xff666666.toInt() + + /** + * Helper method to retrieve the images from our iamge picker + * This is used for both single and multiple photo picks + */ + fun onImagePickerResult(resultCode: Int, data: Intent?): List<ImageModel> { + if (resultCode != Activity.RESULT_OK || data == null || !data.hasExtra(IMAGE_PICKER_RESULT)) + return emptyList() + return data.getParcelableArrayListExtra(IMAGE_PICKER_RESULT) + } + + /** + * Number of loaded images we should cache + * This is arbitrary + */ + const val CACHE_SIZE = 80 + + /** + * We know that Glide takes a while to initially fetch the images + * My as well make it look pretty + */ + const val INITIAL_LOAD_DELAY = 600L + } + + val imageAdapter: FastItemAdapter<T> = FastItemAdapter() + + /** + * Further improve preloading by extending the layout space + */ + val extraSpace: Int by lazy { resources.displayMetrics.heightPixels } + + fun initializeRecycler(recycler: RecyclerView) { + recycler.apply { + val manager = object : GridLayoutManager(context, computeColumnCount(context)) { + override fun getExtraLayoutSpace(state: RecyclerView.State?): Int { + return extraSpace + } + } + setItemViewCacheSize(CACHE_SIZE) + isDrawingCacheEnabled = true + layoutManager = manager + adapter = imageAdapter + setHasFixedSize(true) + itemAnimator = object : KauAnimator(FadeScaleAnimatorAdd(0.8f)) { + override fun startDelay(holder: RecyclerView.ViewHolder, duration: Long, factor: Float): Long { + return super.startDelay(holder, duration, factor) + INITIAL_LOAD_DELAY + } + } + } + } + + //Sort by descending date + var sortQuery = MediaStore.Images.Media.DATE_MODIFIED + " DESC" + + /** + * Request read permissions and load all external images + * The result will be filtered through {@link #onLoadFinished(Loader, Cursor)} + * Call this to make sure that we request permissions each time + * The adapter will be cleared on each successful call + */ + open fun loadImages() { + kauRequestPermissions(Manifest.permission.READ_EXTERNAL_STORAGE) { + granted, _ -> + if (granted) { + supportLoaderManager.initLoader(LOADER_ID, null, this) + onStatusChange(true) + } else { + toast(R.string.kau_permission_denied) + onStatusChange(false) + } + } + } + + override fun onCreateLoader(id: Int, args: Bundle?): Loader<Cursor> { + val columns = arrayOf( + MediaStore.Images.Media._ID, + MediaStore.Images.Media.TITLE, + MediaStore.Images.Media.DATA, + MediaStore.Images.Media.SIZE, + MediaStore.Images.Media.DISPLAY_NAME, + MediaStore.Images.Media.DATE_MODIFIED + ) + return CursorLoader(this, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null, sortQuery) + } + + override fun onLoadFinished(loader: Loader<Cursor>?, data: Cursor?) { + reset() + if (data == null || !data.moveToFirst()) { + toast(R.string.kau_no_images_found) + onStatusChange(false) + return + } + val items = mutableListOf<T>() + do { + val model = ImageModel(data) + if (!shouldLoad(model)) continue + items.add(converter(model)) + } while (data.moveToNext()) + addItems(items) + } + + abstract fun converter(model: ImageModel): T + + override fun onLoaderReset(loader: Loader<Cursor>?) = reset() + + /** + * Called at the end of [onLoadFinished] + * when the adapter should add the items + */ + open fun addItems(items: List<T>) { + imageAdapter.add(items) + } + + /** + * Clears the adapter to prepare for a new load + */ + open fun reset() { + imageAdapter.clear() + } + + /** + * Optional filter to decide which images get displayed + * Defaults to checking their sizes to filter out + * very small images such as lurking drawables/icons + * + * Returns true if model should be displayed, false otherwise + */ + open fun shouldLoad(model: ImageModel): Boolean = model.size > 10000L + + open fun onStatusChange(loaded: Boolean) {} + +}
\ No newline at end of file |