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window.py
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window.py
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from __future__ import annotations
from typing import TYPE_CHECKING
import System.Windows.Forms as WinForms
from System.Drawing import Bitmap, Graphics, Point, Size as WinSize
from System.Drawing.Imaging import ImageFormat
from System.IO import MemoryStream
from toga.command import Separator
from toga.types import Position, Size
from .container import Container
from .libs.wrapper import WeakrefCallable
from .screens import Screen as ScreenImpl
from .widgets.base import Scalable
if TYPE_CHECKING: # pragma: no cover
from toga.types import PositionT, SizeT
class Window(Container, Scalable):
def __init__(self, interface, title, position, size):
self.interface = interface
self.create()
self._FormClosing_handler = WeakrefCallable(self.winforms_FormClosing)
self.native.FormClosing += self._FormClosing_handler
super().__init__(self.native)
self.init_scale(self.native)
self.native.MinimizeBox = self.interface.minimizable
self.native.MaximizeBox = self.interface.resizable
self.set_title(title)
self.set_size(size)
# Winforms does window cascading by default; use that behavior, rather than
# Toga's re-implementation.
if position:
self.set_position(position)
self.native.Resize += WeakrefCallable(self.winforms_Resize)
self.resize_content() # Store initial size
self.set_full_screen(self.interface.full_screen)
def create(self):
self.native = WinForms.Form()
######################################################################
# Native event handlers
######################################################################
def winforms_Resize(self, sender, event):
if self.native.WindowState != WinForms.FormWindowState.Minimized:
self.resize_content()
def winforms_FormClosing(self, sender, event):
# If the app is exiting, do nothing; we've already approved the exit
# (and thus the window close). This branch can't be triggered in test
# conditions, so it's marked no-branch.
#
# Otherwise, handle the close request by always cancelling the event,
# and invoking `on_close()` handling. This will evaluate whether a close
# is allowed, and if it is, programmatically invoke close on the window,
# removing this handler first so that the close will complete.
#
# Winforms doesn't provide a way to disable/hide the close button, so if
# the window is non-closable, don't trigger on_close handling - just
# cancel the close event.
if not self.interface.app._impl._is_exiting: # pragma: no branch
if self.interface.closable:
self.interface.on_close()
event.Cancel = True
######################################################################
# Window properties
######################################################################
def get_title(self):
return self.native.Text
def set_title(self, title):
self.native.Text = title
######################################################################
# Window lifecycle
######################################################################
def close(self):
self.native.FormClosing -= self._FormClosing_handler
self.native.Close()
def set_app(self, app):
icon_impl = app.interface.icon._impl
self.native.Icon = icon_impl.native
def show(self):
if self.interface.content is not None:
self.interface.content.refresh()
self.native.Show()
######################################################################
# Window content and resources
######################################################################
# "Decor" includes the title bar and the (usually invisible) resize borders. It does
# not include the menu bar and toolbar, which are included in the ClientSize (see
# _top_bars_height).
def _decor_width(self):
return self.native.Size.Width - self.native.ClientSize.Width
def _decor_height(self):
return self.native.Size.Height - self.native.ClientSize.Height
def _top_bars_height(self):
return 0
def refreshed(self):
super().refreshed()
layout = self.interface.content.layout
self.native.MinimumSize = WinSize(
self.scale_in(layout.min_width) + self._decor_width(),
self.scale_in(layout.min_height)
+ self._top_bars_height()
+ self._decor_height(),
)
def resize_content(self):
vertical_shift = self._top_bars_height()
self.native_content.Location = Point(0, vertical_shift)
super().resize_content(
self.native.ClientSize.Width,
self.native.ClientSize.Height - vertical_shift,
)
######################################################################
# Window size
######################################################################
def get_size(self) -> Size:
size = self.native.Size
return Size(
self.scale_out(size.Width - self._decor_width()),
self.scale_out(size.Height - self._decor_height()),
)
def set_size(self, size: SizeT):
self.native.Size = WinSize(
self.scale_in(size[0]) + self._decor_width(),
self.scale_in(size[1]) + self._decor_height(),
)
######################################################################
# Window position
######################################################################
def get_current_screen(self):
return ScreenImpl(WinForms.Screen.FromControl(self.native))
def get_position(self) -> Position:
location = self.native.Location
return Position(*map(self.scale_out, (location.X, location.Y)))
def set_position(self, position: PositionT):
self.native.Location = Point(*map(self.scale_in, position))
######################################################################
# Window visibility
######################################################################
def get_visible(self):
return self.native.Visible
def hide(self):
self.native.Hide()
######################################################################
# Window state
######################################################################
def set_full_screen(self, is_full_screen):
if is_full_screen:
self.native.FormBorderStyle = getattr(WinForms.FormBorderStyle, "None")
self.native.WindowState = WinForms.FormWindowState.Maximized
else:
self.native.FormBorderStyle = getattr(
WinForms.FormBorderStyle,
"Sizable" if self.interface.resizable else "FixedSingle",
)
self.native.WindowState = WinForms.FormWindowState.Normal
######################################################################
# Window capabilities
######################################################################
def get_image_data(self):
size = WinSize(self.native_content.Size.Width, self.native_content.Size.Height)
bitmap = Bitmap(size.Width, size.Height)
graphics = Graphics.FromImage(bitmap)
graphics.CopyFromScreen(
self.native_content.PointToScreen(Point.Empty),
Point(0, 0),
size,
)
stream = MemoryStream()
bitmap.Save(stream, ImageFormat.Png)
return bytes(stream.ToArray())
class MainWindow(Window):
def create(self):
super().create()
self.toolbar_native = None
def _top_bars_height(self):
vertical_shift = 0
if self.toolbar_native:
vertical_shift += self.toolbar_native.Height
if self.native.MainMenuStrip:
vertical_shift += self.native.MainMenuStrip.Height
return vertical_shift
def _submenu(self, group, group_cache):
try:
return group_cache[group]
except KeyError:
parent_menu = self._submenu(group.parent, group_cache)
submenu = WinForms.ToolStripMenuItem(group.text)
# Top level menus are added in a different way to submenus
if group.parent is None:
parent_menu.Items.Add(submenu)
else:
parent_menu.DropDownItems.Add(submenu)
group_cache[group] = submenu
return submenu
def create_menus(self):
menubar = self.native.MainMenuStrip
if menubar:
menubar.Items.Clear()
else:
# The menu bar doesn't need to be positioned, because its `Dock` property
# defaults to `Top`.
menubar = WinForms.MenuStrip()
self.native.Controls.Add(menubar)
self.native.MainMenuStrip = menubar
menubar.SendToBack() # In a dock, "back" means "top".
group_cache = {None: menubar}
submenu = None
for cmd in self.interface.app.commands:
submenu = self._submenu(cmd.group, group_cache)
if isinstance(cmd, Separator):
item = "-"
else:
item = cmd._impl.create_menu_item(WinForms.ToolStripMenuItem)
submenu.DropDownItems.Add(item)
self.resize_content()
def create_toolbar(self):
if self.interface.toolbar:
if self.toolbar_native:
self.toolbar_native.Items.Clear()
else:
# The toolbar doesn't need to be positioned, because its `Dock` property
# defaults to `Top`.
self.toolbar_native = WinForms.ToolStrip()
self.native.Controls.Add(self.toolbar_native)
self.toolbar_native.BringToFront() # In a dock, "front" means "bottom".
prev_group = None
for cmd in self.interface.toolbar:
if isinstance(cmd, Separator):
item = WinForms.ToolStripSeparator()
prev_group = None
else:
# A change in group requires adding a toolbar separator
if prev_group is not None and prev_group != cmd.group:
self.toolbar_native.Items.Add(WinForms.ToolStripSeparator())
prev_group = None
else:
prev_group = cmd.group
item = WinForms.ToolStripMenuItem(cmd.text)
if cmd.tooltip is not None:
item.ToolTipText = cmd.tooltip
if cmd.icon is not None:
item.Image = cmd.icon._impl.native.ToBitmap()
item.Enabled = cmd.enabled
item.Click += WeakrefCallable(cmd._impl.winforms_Click)
cmd._impl.native.append(item)
self.toolbar_native.Items.Add(item)
elif self.toolbar_native:
self.native.Controls.Remove(self.toolbar_native)
self.toolbar_native = None
self.resize_content()