1 files changed, 106 insertions, 0 deletions
diff --git a/src/prompt_toolkit/widgets/dialogs.py b/src/prompt_toolkit/widgets/dialogs.py
new file mode 100644
index 0000000..920582b
--- /dev/null
+++ b/src/prompt_toolkit/widgets/dialogs.py
@@ -0,0 +1,106 @@
+"""
+Collection of reusable components for building full screen applications.
+"""
+from typing import Optional, Sequence, Union
+
+from prompt_toolkit.filters import has_completions, has_focus
+from prompt_toolkit.formatted_text import AnyFormattedText
+from prompt_toolkit.key_binding.bindings.focus import focus_next, focus_previous
+from prompt_toolkit.key_binding.key_bindings import KeyBindings
+from prompt_toolkit.layout.containers import (
+    AnyContainer,
+    DynamicContainer,
+    HSplit,
+    VSplit,
+)
+from prompt_toolkit.layout.dimension import AnyDimension
+from prompt_toolkit.layout.dimension import Dimension as D
+
+from .base import Box, Button, Frame, Shadow
+
+__all__ = [
+    "Dialog",
+]
+
+
+class Dialog:
+    """
+    Simple dialog window. This is the base for input dialogs, message dialogs
+    and confirmation dialogs.
+
+    Changing the title and body of the dialog is possible at runtime by
+    assigning to the `body` and `title` attributes of this class.
+
+    :param body: Child container object.
+    :param title: Text to be displayed in the heading of the dialog.
+    :param buttons: A list of `Button` widgets, displayed at the bottom.
+    """
+
+    def __init__(
+        self,
+        body: AnyContainer,
+        title: AnyFormattedText = "",
+        buttons: Optional[Sequence[Button]] = None,
+        modal: bool = True,
+        width: AnyDimension = None,
+        with_background: bool = False,
+    ) -> None:
+
+        self.body = body
+        self.title = title
+
+        buttons = buttons or []
+
+        # When a button is selected, handle left/right key bindings.
+        buttons_kb = KeyBindings()
+        if len(buttons) > 1:
+            first_selected = has_focus(buttons[0])
+            last_selected = has_focus(buttons[-1])
+
+            buttons_kb.add("left", filter=~first_selected)(focus_previous)
+            buttons_kb.add("right", filter=~last_selected)(focus_next)
+
+        frame_body: AnyContainer
+        if buttons:
+            frame_body = HSplit(
+                [
+                    # Add optional padding around the body.
+                    Box(
+                        body=DynamicContainer(lambda: self.body),
+                        padding=D(preferred=1, max=1),
+                        padding_bottom=0,
+                    ),
+                    # The buttons.
+                    Box(
+                        body=VSplit(buttons, padding=1, key_bindings=buttons_kb),
+                        height=D(min=1, max=3, preferred=3),
+                    ),
+                ]
+            )
+        else:
+            frame_body = body
+
+        # Key bindings for whole dialog.
+        kb = KeyBindings()
+        kb.add("tab", filter=~has_completions)(focus_next)
+        kb.add("s-tab", filter=~has_completions)(focus_previous)
+
+        frame = Shadow(
+            body=Frame(
+                title=lambda: self.title,
+                body=frame_body,
+                style="class:dialog.body",
+                width=(None if with_background is None else width),
+                key_bindings=kb,
+                modal=modal,
+            )
+        )
+
+        self.container: Union[Box, Shadow]
+        if with_background:
+            self.container = Box(body=frame, style="class:dialog", width=width)
+        else:
+            self.container = frame
+
+    def __pt_container__(self) -> AnyContainer:
+        return self.container