Add pressed() method

Author: jsfehler

docs/keyboard.rst

@@ -16,9 +16,13 @@ keyboard events inside the current browser window.
 .. note:: Input detection is limited to the page. You cannot control the browser
   or your operating system directly using the keyboard.
 
+The keyboard interface is generally used to trigger modifier keys.
+For text input, using the keyboard is not recommended. Instead, use the
+:func:`element.fill() <splinter.driver.ElementAPI.fill>` method.
+
 .. note:: The control modifier key is different across operating systems.
-  e.g.: macOS uses `Command` and Windows & Linux use `Control`.
-  If you need a cross-platform solution, `CTRL` can be used and will be resolved
+  e.g.: macOS uses `COMMAND` and Windows & Linux use `CONTROL`.
+  For a cross-platform solution, `CTRL` can be used and will be resolved
   for you.
 
 Actions
@@ -86,6 +90,23 @@ This allows multiple presses to be chained together:
   the press method is designed for single keys. There may be unintended
   side effects to using it in place of Element.fill() or Element.type().
 
+Press Using a Context Manager
+-----------------------------
+
+Using the `pressed()` method, a context manager will be invoked.
+The specified key will be held down, then released when the block is exited.
+
+.. code-block:: python
+
+    from splinter import Browser
+
+
+    browser = Browser()
+    browser.visit("https://duckduckgo.com/")
+    with browser.keyboard.pressed("SHIFT"):
+        browser.find_by_css("[@name='q']").fill('splinter')
+
+
 Element.press()
 ---------------
 

splinter/driver/webdriver/keyboard.py

@@ -1,4 +1,6 @@
+import contextlib
 import platform
+from collections.abc import Iterator
 from typing import Union
 
 from selenium.webdriver.common.action_chains import ActionChains
@@ -136,3 +138,19 @@ def press(self, key_pattern: str, delay: int = 0) -> "Keyboard":
         chain.perform()
 
         return self
+
+    @contextlib.contextmanager
+    def pressed(self, key_pattern: str) -> Iterator[None]:
+        """Hold a key pattern inside a `with` block and releas it upon exit.
+
+        Arguments:
+            key_pattern: Pattern of keys to hold and release.
+
+        Example:
+            >>> b = Browser()
+            >>> with b.keyboard.pressed('CONTROL'):
+            >>>     ...
+        """
+        self.down(key_pattern)
+        yield
+        self.up(key_pattern)

tests/tests_webdriver/test_keyboard.py

@@ -1,13 +1,8 @@
-from splinter.driver.webdriver import Keyboard
-
-
 def test_keyboard_down_modifier(browser, app_url):
     """Scenario: Keys can be held down"""
     browser.visit(app_url)
 
-    keyboard = Keyboard(browser.driver)
-
-    keyboard.down("CONTROL")
+    browser.keyboard.down("CONTROL")
 
     elem = browser.find_by_css("#keypress_detect")
     assert elem.first
@@ -17,22 +12,18 @@ def test_keyboard_up_modifier(browser, app_url):
     """Scenario: Keys can be held up"""
     browser.visit(app_url)
 
-    keyboard = Keyboard(browser.driver)
-
-    keyboard.down("CONTROL")
-    keyboard.up("CONTROL")
+    browser.keyboard.down("CONTROL")
+    browser.keyboard.up("CONTROL")
 
     elem = browser.find_by_css("#keyup_detect")
     assert elem.first
 
 
 def test_keyboard_press_modifier(browser, app_url):
-    """Keys can be pressed"""
+    """Scenario: Keys can be pressed"""
     browser.visit(app_url)
 
-    keyboard = Keyboard(browser.driver)
-
-    keyboard.press("CONTROL")
+    browser.keyboard.press("CONTROL")
 
     elem = browser.find_by_css("#keyup_detect")
     assert elem.first
@@ -42,14 +33,27 @@ def test_element_press_combo(browser, app_url):
     """Scenario: Key presses can be used in a combo"""
     browser.visit(app_url)
 
-    keyboard = Keyboard(browser.driver)
-
-    keyboard.press("CONTROL+a")
+    browser.keyboard.press("CONTROL+a")
 
     elem = browser.find_by_css("#keypress_detect_a")
     assert elem.first
 
 
+def test_keyboard_pressed_modifier(browser, app_url):
+    """Scenario: Keys can be pressed by a context manager."""
+    browser.visit(app_url)
+
+    with browser.keyboard.pressed("CONTROL"):
+        down_elem = browser.find_by_css("#keypress_detect")
+        assert down_elem.first
+
+        up_elem = browser.find_by_css("#keyup_detect")
+        assert up_elem.is_empty()
+
+    up_elem = browser.find_by_css("#keyup_detect")
+    assert up_elem.first
+
+
 def test_keyboard_ctrl(browser, app_url):
     """Scenario: The CTRL value is correct across platforms"""
     browser.visit(app_url)