Initial commit

src/view.d

@@ -0,0 +1,157 @@
+import termbox;
+import cursor;
+import buffer;
+import clipboard;
+
+import std.conv: to;
+import std.stdio;
+
+class View {
+    int topline;
+    int xOffset;
+
+    int width;
+    int height;
+
+    Buffer buf;
+    Cursor cursor;
+
+    this(Buffer buf, int topline = 0, int width = termbox.width(), int height = termbox.height()-2) {
+        this.topline = topline;
+        this.width = width;
+        this.height = height;
+
+        this.buf = buf;
+        this.cursor = new Cursor(buf);
+    }
+
+    void cursorUp() {
+        if (cursor.y > 0) {
+            cursor.y--;
+            cursor.x = cursor.lastX;
+            if (cursor.x > buf.lines[cursor.y].length) {
+                cursor.x = cast(int) buf.lines[cursor.y].length;
+            }
+        }
+    }
+
+    void cursorDown() {
+        if (cursor.y < buf.lines.length - 1) {
+            cursor.y++;
+            cursor.x = cursor.lastX;
+            if (cursor.x > buf.lines[cursor.y].length) {
+                cursor.x = cast(int) buf.lines[cursor.y].length;
+            }
+        }
+    }
+
+    void cursorRight() {
+        if (cursor.x < buf.lines[cursor.y].length) {
+            cursor.x++;
+            cursor.lastX = cursor.x;
+        }
+    }
+
+    void cursorLeft() {
+        if (cursor.x > 0) {
+            cursor.x--;
+            cursor.lastX = cursor.x;
+        }
+    }
+
+    void update(Event e) {
+        if (e.key == Key.mouseWheelUp) {
+            if (topline > 0) {
+                topline--;
+            }
+        } else if (e.key == Key.mouseWheelDown) {
+            if (topline < buf.lines.length - height) {
+                topline++;
+            }
+        } else {
+            if (e.key == Key.arrowUp) {
+                cursorUp();
+            } else if (e.key == Key.arrowDown) {
+                cursorDown();
+            } else if (e.key == Key.arrowRight) {
+                cursorRight();
+            } else if (e.key == Key.arrowLeft) {
+                cursorLeft();
+            } else if (e.key == Key.mouseLeft) {
+                cursor.x = e.x - xOffset;
+                if (cursor.x < 0) {
+                    cursor.x = 0;
+                }
+                cursor.y = e.y + topline;
+                cursor.lastX = cursor.x;
+                if (cursor.x > buf.lines[cursor.y].length) {
+                    cursor.x = cast(int) buf.lines[cursor.y].length;
+                }
+            } else if (e.key == Key.ctrl_s) {
+                buf.save();
+            } else if (e.key == Key.ctrl_v) {
+                if (Clipboard.supported) {
+                    buf.insert(cursor.loc, Clipboard.read());
+                }
+            } else {
+                if (e.ch != 0) {
+                    buf.insert(cursor.loc, to!string(to!char(e.ch)));
+                    cursorRight();
+                } else if (e.key == Key.space) {
+                    buf.insert(cursor.loc, " ");
+                    cursorRight();
+                } else if (e.key == Key.enter) {
+                    buf.insert(cursor.loc, "\n");
+                    cursor.loc = cursor.loc + 1;
+                } else if (e.key == Key.backspace2) {
+                    if (cursor.loc != 0) {
+                        cursor.loc = cursor.loc - 1;
+                        buf.remove(cursor.loc, cursor.loc + 1);
+                    }
+                }
+            }
+
+            if (cursor.y < topline) {
+                topline--;
+            }
+
+            if (cursor.y > topline + height-1) {
+                topline++;
+            }
+        }
+    }
+
+    void display() {
+        int x, y;
+        string[] lines;
+        if (topline + height > buf.lines.length) {
+            lines = buf.lines[topline .. $];
+        } else  {
+            lines = buf.lines[topline .. topline + height];
+        }
+        ulong maxLength = to!string(buf.lines.length).length;
+        xOffset = cast(int) maxLength + 1;
+        foreach (i, line; lines) {
+            string lineNum = to!string(i + topline + 1);
+            foreach (_; 0 .. maxLength - lineNum.length) {
+                setCell(cast(int) x++, cast(int) y, ' ', Color.default_, Color.black);
+            }
+            foreach (ch; lineNum) {
+                setCell(cast(int) x++, cast(int) y, ch, Color.default_, Color.black);
+            }
+            setCell(cast(int) x++, cast(int) y, ' ', Color.default_ | Attribute.bold, Color.black);
+
+            foreach (ch; line) {
+                setCell(cast(int) x++, cast(int) y, ch, Color.default_, Color.default_);
+            }
+            y++;
+            x = 0;
+        }
+
+        if (cursor.y - topline < 0 || cursor.y - topline > height) {
+            hideCursor();
+        } else {
+            setCursor(cursor.x + xOffset, cursor.y - topline);
+        }
+    }
+}