Add an extra keys view

2025-09-06 02:35:19 +08:00 · 2016-05-20 10:41:38 +02:00
parent 042fbfaea3
commit 8714800c6b
1 changed files with 144 additions and 0 deletions
--- a/app/src/main/java/com/termux/app/ExtraKeysView.java
+++ b/app/src/main/java/com/termux/app/ExtraKeysView.java
@@ -0,0 +1,144 @@
+package com.termux.app;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.Gravity;
+import android.view.KeyEvent;
+import android.view.View;
+import android.widget.Button;
+import android.widget.GridLayout;
+import android.widget.ToggleButton;
+
+import com.termux.view.TerminalView;
+
+/**
+ * A view showing extra keys (such as Escape, Ctrl, Alt) not normally available on an Android soft
+ * keyboard.
+ */
+public final class ExtraKeysView extends GridLayout implements TerminalView.KeyboardModifiers {
+
+    private static final int TEXT_COLOR = 0xFFFFFFFF;
+
+    public ExtraKeysView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        reload();
+    }
+
+    private static int keyNameToKeyCode(String keyName) {
+        switch (keyName) {
+            case "ESC": return KeyEvent.KEYCODE_ESCAPE;
+            case "TAB": return KeyEvent.KEYCODE_TAB;
+            case "▲": return KeyEvent.KEYCODE_DPAD_UP;
+            case "◀": return KeyEvent.KEYCODE_DPAD_LEFT;
+            case "▶": return KeyEvent.KEYCODE_DPAD_RIGHT;
+            case "▼": return KeyEvent.KEYCODE_DPAD_DOWN;
+            default: return -1;
+        }
+    }
+
+    private ToggleButton controlButton;
+    private ToggleButton altButton;
+    private ToggleButton fnButton;
+
+    public boolean readControlButton() {
+        boolean result = controlButton.isChecked();
+        if (result) {
+            controlButton.setChecked(false);
+            controlButton.setTextColor(TEXT_COLOR);
+        }
+        return result;
+    }
+
+    public boolean readAltButton() {
+        boolean result = altButton.isChecked();
+        if (result) {
+            altButton.setChecked(false);
+            altButton.setTextColor(TEXT_COLOR);
+        }
+        return result;
+    }
+
+    public boolean readFnButton() {
+        boolean result = fnButton.isChecked();
+        if (result) {
+            fnButton.setChecked(false);
+            fnButton.setTextColor(TEXT_COLOR);
+        }
+        return result;
+    }
+
+    void reload() {
+        altButton = controlButton = null;
+        removeAllViews();
+
+        String[][] buttons = {
+            {"ESC", "CTRL", "ALT", "▲", "▼", "◀", "▶"}
+        };
+
+        final int rows = buttons.length;
+        final int cols = buttons[0].length;
+
+        setRowCount(rows);
+        setColumnCount(cols);
+
+        for (int row = 0; row < rows; row++) {
+            for (int col = 0; col < cols; col++) {
+                final String buttonText = buttons[row][col];
+
+                Button button;
+                switch (buttonText) {
+                    case "CTRL":
+                        button = controlButton = new ToggleButton(getContext(), null, android.R.attr.buttonBarButtonStyle);
+                        break;
+                    case "ALT":
+                        button = altButton = new ToggleButton(getContext(), null, android.R.attr.buttonBarButtonStyle);
+                        break;
+                    case "FN":
+                        button = fnButton = new ToggleButton(getContext(), null, android.R.attr.buttonBarButtonStyle);
+                        break;
+                    default:
+                        button = new Button(getContext(), null, android.R.attr.buttonBarButtonStyle);
+                        break;
+                }
+
+                button.setText(buttonText);
+                button.setTextColor(TEXT_COLOR);
+
+                final Button finalButton = button;
+                button.setOnClickListener(new OnClickListener() {
+                    @Override
+                    public void onClick(View v) {
+                        View root = getRootView();
+                        switch (buttonText) {
+                            case "CTRL":
+                            case "ALT":
+                            case "FN":
+                                ToggleButton self = (ToggleButton) finalButton;
+                                self.setChecked(self.isChecked());
+                                self.setTextColor(self.isChecked() ? 0xFF80DEEA : TEXT_COLOR);
+                                break;
+                            default:
+                                int keyCode = keyNameToKeyCode(buttonText);
+                                root.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, keyCode));
+                                root.dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, keyCode));
+                                break;
+                        }
+                    }
+                });
+
+                GridLayout.LayoutParams param = new GridLayout.LayoutParams();
+                param.height = param.width = 0;
+                param.rightMargin = param.topMargin = 0;
+                param.setGravity(Gravity.LEFT);
+                float weight = "▲▼◀▶".contains(buttonText) ? 0.7f : 1.f;
+                param.columnSpec = GridLayout.spec(col, weight);
+                param.rowSpec = GridLayout.spec(row, 1.f);
+                button.setLayoutParams(param);
+
+                addView(button);
+            }
+        }
+    }
+
+}