add lisp packages

lisp/emacs-application-framework/core/view.py

@@ -0,0 +1,122 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright (C) 2018 Andy Stewart
+#
+# Author:     Andy Stewart <lazycat.manatee@gmail.com>
+# Maintainer: Andy Stewart <lazycat.manatee@gmail.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from PyQt5 import QtCore
+from PyQt5.QtCore import Qt, QEvent, QPoint
+from PyQt5.QtGui import QPainter, QWindow
+from PyQt5.QtWidgets import QWidget, QVBoxLayout, QGraphicsView
+
+class View(QWidget):
+
+    trigger_focus_event = QtCore.pyqtSignal(str)
+
+    def __init__(self, buffer, view_info):
+        super(View, self).__init__()
+
+        self.buffer = buffer
+
+        # Init widget attributes.
+        self.setWindowFlags(Qt.FramelessWindowHint)
+        self.setAttribute(Qt.WA_X11DoNotAcceptFocus, True)
+        self.setContentsMargins(0, 0, 0, 0)
+        self.installEventFilter(self)
+
+        # Init attributes.
+        self.view_info = view_info
+        (self.buffer_id, self.emacs_xid, self.x, self.y, self.width, self.height) = view_info.split(":")
+        self.emacs_xid = int(self.emacs_xid)
+        self.x = int(self.x)
+        self.y = int(self.y)
+        self.width = int(self.width)
+        self.height = int(self.height)
+
+        # Build QGraphicsView.
+        self.layout = QVBoxLayout(self)
+        self.layout.setContentsMargins(0, 0, 0, 0)
+        self.graphics_view = QGraphicsView(buffer, self)
+        self.graphics_view.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
+        self.graphics_view.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
+        self.graphics_view.setRenderHints(QPainter.Antialiasing | QPainter.SmoothPixmapTransform | QPainter.TextAntialiasing)
+        # Remove damn border from QGraphicsView.
+        self.graphics_view.setFrameStyle(0)
+        self.graphics_view.setStyleSheet("QGraphicsView {background: transparent; border: 3px; outline: none;}")
+        self.layout.addWidget(self.graphics_view)
+
+        # NOTE: show function must start before resize to trigger *first* resizeEvent after show.
+        self.show()
+
+        # Resize after show to trigger fit view operation.
+        self.resize(self.width, self.height)
+
+        self.buffer.aspect_ratio_change.connect(self.adjust_aspect_ratio)
+
+    def resizeEvent(self, event):
+        # Fit content to view rect just when buffer fit_to_view option is enable.
+        if self.buffer.fit_to_view:
+            if event.oldSize().isValid():
+                self.graphics_view.fitInView(self.graphics_view.scene().sceneRect(), Qt.KeepAspectRatio)
+        QWidget.resizeEvent(self, event)
+
+    def adjust_aspect_ratio(self):
+        widget_width = self.width
+        widget_height = self.height
+
+        if self.buffer.aspect_ratio == 0:
+            self.buffer.buffer_widget.resize(self.width, self.height)
+
+            self.layout.setContentsMargins(0, 0, 0, 0)
+        else:
+            view_height = widget_height * (1 - 2 * self.buffer.vertical_padding_ratio)
+            view_width = view_height * self.buffer.aspect_ratio
+            horizontal_padding = (widget_width - view_width) / 2
+            vertical_padding = self.buffer.vertical_padding_ratio * widget_height
+
+            self.buffer.buffer_widget.resize(view_width, view_height)
+
+            self.layout.setContentsMargins(
+                horizontal_padding, vertical_padding,
+                horizontal_padding, vertical_padding)
+
+    def eventFilter(self, obj, event):
+        # Focus emacs buffer when user click view.
+        if event.type() in [QEvent.MouseButtonPress, QEvent.MouseButtonRelease,
+                            QEvent.MouseButtonDblClick, QEvent.Wheel]:
+            self.trigger_focus_event.emit(self.buffer_id)
+            # Stop mouse event.
+            return True
+
+        return False
+
+    def showEvent(self, event):
+        # NOTE: we must reparent after widget show, otherwise reparent operation maybe failed.
+        self.reparent()
+
+        # Make graphics view at left-top corner after show.
+        self.graphics_view.verticalScrollBar().setValue(0)
+        self.graphics_view.horizontalScrollBar().setValue(0)
+
+    def reparent(self):
+        qwindow = self.windowHandle()
+        qwindow.setParent(QWindow.fromWinId(self.emacs_xid))
+        qwindow.setPosition(QPoint(self.x, self.y))
+
+    def destroy_view(self):
+        self.destroy()