FileIoDemo Partial

FileIoDemo.kt

/*
 * Copyright 2018 PolyForest
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package fileiodemo

import com.acornui.async.*
import com.acornui.component.button
import com.acornui.component.layout.algorithm.VerticalLayoutContainer
import com.acornui.component.layout.algorithm.hGroup
import com.acornui.component.stack
import com.acornui.component.stage
import com.acornui.component.text.TextArea
import com.acornui.component.text.text
import com.acornui.component.text.textArea
import com.acornui.core.di.Owned
import com.acornui.core.di.inject
import com.acornui.core.immutable.dataBinding
import com.acornui.core.input.interaction.click
import com.acornui.core.popup.alert
import com.acornui.file.FileFilterGroup
import com.acornui.file.FileIoManager
import com.acornui.file.FileReader
import com.acornui.skins.BasicUiSkin
class FileIoDemo(owner: Owned) : VerticalLayoutContainer(owner) {

	private lateinit var editor: TextArea
	private val dataBinding = dataBinding<List<FileVo>>(emptyList())

	private data class FileVo (val name: String, val size: Long, val lastModified: Long, val contents: Deferred<String>) {
		constructor(reader: FileReader) : this(reader.name, reader.size, reader.lastModified, async { return@async reader.readAsString() })
	}

	private var fileManager: FileIoManager
	private val saveSupported: Boolean
	// Set extensions to null for all.
	private val filterGroups = listOf(listOf(".txt",".kt"), listOf("zip"), listOf("image/*")).map { FileFilterGroup(it) }
	private var multipleFilesOpen = false

	init {
		BasicUiSkin(stage).apply()
		fileManager = inject(FileIoManager)
		saveSupported = fileManager.saveSupported

		+hGroup {
			+text("File Io Demo")
			+hGroup {
				style.gap = 0f
				dataBinding.bind {
					clearElements(dispose = true)
					if (it.isNotEmpty()) apply {
						for (i in 0..it.lastIndex) {
							if (i < 1)
								+text(" - ${it[i].name}")
							else
								+text(" | ${it[i].name}")
						}
					}
				}
			}
		}

		+hGroup {
			+button("Open File") {
				click().add {
					openFile()
				}
			}

			+button("Open Files") {
				click().add {
					openFiles()
				}
			}

			+button("Save File") {
				dataBinding.bind {
					visible = saveSupported && !multipleFilesOpen && it.isNotEmpty()
				}
				click().add {
					saveFile()
				}
			}

			+button("Clear Files") {
				click().add {
					clearFiles()
				}
			}
		}

		+stack {
			editor = +textArea {
				dataBinding.bind { fileList ->
					var fileContents = ""
					text = when {
						fileList.size > 1 -> fileList.joinToString("\n\n\n") {
							launch { fileContents = it.contents.await() }
							"${it.name}\n$fileContents" }
						fileList.size == 1 -> {
							launch { fileContents = fileList[0].contents.await() }
							fileContents
						}
						else -> fileContents
					}
					visible = !isDisposed && fileList.isNotEmpty()
				}
			} layout { fill() }
		} layout { fill() }
	}

	private fun openFile() {
		fileManager.pickFileForOpen(filterGroups) {
			@Suppress("UNCHECKED_CAST")
			dataBinding.value = filterBadFiles(listOf(FileVo(it)))
		}
	}

	private fun openFiles() {
		fileManager.pickFilesForOpen(filterGroups) {
			dataBinding.value = filterBadFiles(it.map { FileVo(it) })
		}
	}

	private fun saveFile() {
		fileManager.pickFileForSave(filterGroups, "txt") {
			async { it.saveToFileAsString(editor.text) }
		}
	}

	private fun clearFiles() {
		dataBinding.value = emptyList()
	}

	private fun filterBadFiles(fileList: List<FileVo>): List<FileVo> {
		val aList = fileList.filterNot {
				try {
					launch { it.contents.await() }
					false
				} catch (e: Exception) {
					alert("Error", e.message ?: "Some unknown error has occurred.")
					true
				}
		}
		return aList
	}
}