Add fullscreen mode in PDF Viewer

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/activities/PDFViewerActivity.kt

@@ -1,20 +1,36 @@
 package com.simplemobiletools.filemanager.pro.activities
 
 import android.content.Context
+import android.content.res.Configuration.UI_MODE_NIGHT_NO
 import android.os.Bundle
 import android.print.PrintAttributes
 import android.print.PrintManager
 import android.view.Menu
 import android.view.MenuItem
+import android.view.View
+import android.view.WindowManager
+import android.widget.RelativeLayout
+import androidx.core.view.updateLayoutParams
 import com.github.barteksc.pdfviewer.scroll.DefaultScrollHandle
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.REAL_FILE_PATH
+import com.simplemobiletools.commons.helpers.isPiePlus
+import com.simplemobiletools.commons.helpers.isSPlus
 import com.simplemobiletools.filemanager.pro.R
+import com.simplemobiletools.filemanager.pro.extensions.config
+import com.simplemobiletools.filemanager.pro.extensions.getUiMode
+import com.simplemobiletools.filemanager.pro.extensions.hideSystemUI
+import com.simplemobiletools.filemanager.pro.extensions.showSystemUI
 import com.simplemobiletools.filemanager.pro.helpers.PdfDocumentAdapter
 import kotlinx.android.synthetic.main.activity_pdf_viewer.*
 
+
 class PDFViewerActivity : SimpleActivity() {
-    var realFilePath = ""
+    private var realFilePath = ""
+
+    private var systemUiVisible = true
+    private var pdfViewerHeight = -1
+    private var positionOffset = 0f
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -29,6 +45,7 @@ class PDFViewerActivity : SimpleActivity() {
         }
 
         checkIntent()
+        setupFullScreenView()
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
@@ -76,4 +93,48 @@ class PDFViewerActivity : SimpleActivity() {
             print(realFilePath.getFilenameFromPath(), adapter, PrintAttributes.Builder().build())
         }
     }
+
+    private fun setupFullScreenView() {
+        pdf_viewer.setOnClickListener {
+            if (systemUiVisible) enterFullScreen() else exitFullScreen()
+            systemUiVisible = !systemUiVisible
+        }
+        setupNotch()
+    }
+
+    private fun enterFullScreen() {
+        if (pdfViewerHeight == -1) {
+            pdfViewerHeight = pdf_viewer.height
+        }
+        positionOffset = pdf_viewer.positionOffset
+        hideSystemUI(true)
+
+        pdf_viewer.updateLayoutParams<RelativeLayout.LayoutParams> {
+            // hack to workaround pdf viewer height glitch
+            this.height = pdf_viewer_wrapper.height + statusBarHeight + actionBarHeight
+        }
+    }
+
+    private fun exitFullScreen() {
+        showSystemUI(true)
+        pdf_viewer.updateLayoutParams<RelativeLayout.LayoutParams> {
+            this.height = pdfViewerHeight
+        }
+        pdf_viewer.post { pdf_viewer.positionOffset = positionOffset }
+
+        @Suppress("DEPRECATION")
+        // use light status bar on material you
+        if (isSPlus() && config.isUsingSystemTheme && getUiMode() == UI_MODE_NIGHT_NO) {
+            val flags = window.decorView.systemUiVisibility
+            window.decorView.systemUiVisibility = flags or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
+        }
+    }
+
+
+    private fun setupNotch() {
+        if (isPiePlus()) {
+            window.attributes.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
+            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
+        }
+    }
 }

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/extensions/Activity.kt

@@ -2,7 +2,10 @@ package com.simplemobiletools.filemanager.pro.extensions
 
 import android.app.Activity
 import android.content.Intent
+import android.content.res.Configuration
 import android.net.Uri
+import android.view.View
+import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.FileProvider
 import com.simplemobiletools.commons.activities.BaseSimpleActivity
 import com.simplemobiletools.commons.extensions.*
@@ -10,7 +13,6 @@ import com.simplemobiletools.commons.helpers.isNougatPlus
 import com.simplemobiletools.filemanager.pro.BuildConfig
 import com.simplemobiletools.filemanager.pro.helpers.*
 import java.io.File
-import java.util.*
 
 fun Activity.sharePaths(paths: ArrayList<String>) {
     sharePathsIntent(paths, BuildConfig.APPLICATION_ID)
@@ -77,3 +79,28 @@ fun BaseSimpleActivity.toggleItemVisibility(oldPath: String, hide: Boolean, call
         }
     }
 }
+
+@Suppress("DEPRECATION")
+fun AppCompatActivity.showSystemUI(toggleActionBarVisibility: Boolean) {
+    if (toggleActionBarVisibility) {
+        supportActionBar?.show()
+    }
+    window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_VISIBLE
+}
+
+@Suppress("DEPRECATION")
+fun AppCompatActivity.hideSystemUI(toggleActionBarVisibility: Boolean) {
+    if (toggleActionBarVisibility) {
+        supportActionBar?.hide()
+    }
+
+    window.decorView.systemUiVisibility =
+        View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or
+            View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or
+            View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or
+            View.SYSTEM_UI_FLAG_LOW_PROFILE or
+            View.SYSTEM_UI_FLAG_FULLSCREEN or
+            View.SYSTEM_UI_FLAG_IMMERSIVE
+}
+
+fun Activity.getUiMode() = resources?.configuration?.uiMode?.and(Configuration.UI_MODE_NIGHT_MASK)