326 lines
12 KiB
Lua
326 lines
12 KiB
Lua
---------------------------------------------------------------------------
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-- Management of widget hierarchies. Each widget hierarchy object has a widget
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-- for which it saves e.g. size and transformation in its parent. Also, each
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-- widget has a number of children.
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--
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-- @author Uli Schlachter
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-- @copyright 2015 Uli Schlachter
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-- @release @AWESOME_VERSION@
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-- @module wibox.hierarchy
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---------------------------------------------------------------------------
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local matrix = require("gears.matrix")
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local cairo = require("lgi").cairo
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local base = require("wibox.widget.base")
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local no_parent = base.no_parent_I_know_what_I_am_doing
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local hierarchy = {}
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local function hierarchy_new(widget, redraw_callback, layout_callback, callback_arg)
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local result = {
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_matrix = matrix.identity,
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_matrix_to_device = matrix.identity,
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_need_update = true,
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_widget = nil,
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_redraw_callback = redraw_callback,
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_layout_callback = layout_callback,
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_callback_arg = callback_arg,
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_size = {
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width = nil,
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height = nil
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},
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_draw_extents = {
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x = 0,
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y = 0,
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width = 0,
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height = 0
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},
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_parent = nil,
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_children = {}
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}
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function result._redraw()
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redraw_callback(result, callback_arg)
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end
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function result._layout()
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local h = result
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while h do
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h._need_update = true
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h = h._parent
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end
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layout_callback(result, callback_arg)
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end
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for k, f in pairs(hierarchy) do
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if type(f) == "function" then
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result[k] = f
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end
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end
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return result
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end
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local hierarchy_update
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function hierarchy_update(self, context, widget, width, height, region, matrix_to_parent, matrix_to_device)
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if (not self._need_update) and self._widget == widget and
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self._size.width == width and self._size.height == height and
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matrix.equals(self._matrix, matrix_to_parent) and
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matrix.equals(self._matrix_to_device, matrix_to_device) then
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-- Nothing changed
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return
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end
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self._need_update = false
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local old_x, old_y, old_width, old_height
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local old_widget = self._widget
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if self._size.width and self._size.height then
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local x, y, w, h = matrix.transform_rectangle(self._matrix_to_device, 0, 0, self._size.width, self._size.height)
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old_x, old_y = math.floor(x), math.floor(y)
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old_width, old_height = math.ceil(x + w) - old_x, math.ceil(y + h) - old_y
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else
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old_x, old_y, old_width, old_height = 0, 0, 0, 0
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end
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-- Disconnect old signals
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if old_widget and old_widget ~= widget then
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self._widget:disconnect_signal("widget::redraw_needed", self._redraw)
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self._widget:disconnect_signal("widget::layout_changed", self._layout)
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end
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-- Save the arguments we need to save
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self._widget = widget
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self._size.width = width
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self._size.height = height
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self._matrix = matrix_to_parent
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self._matrix_to_device = matrix_to_device
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-- Connect signals
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if old_widget ~= widget then
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widget:weak_connect_signal("widget::redraw_needed", self._redraw)
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widget:weak_connect_signal("widget::layout_changed", self._layout)
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end
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-- Update children
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local old_children = self._children
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local layout_result = base.layout_widget(no_parent, context, widget, width, height)
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self._children = {}
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for _, w in ipairs(layout_result or {}) do
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local r = table.remove(old_children, 1)
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if not r then
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r = hierarchy_new(w._widget, self._redraw_callback, self._layout_callback, self._callback_arg)
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r._parent = self
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end
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hierarchy_update(r, context, w._widget, w._width, w._height, region, w._matrix, matrix_to_device * w._matrix)
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table.insert(self._children, r)
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end
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-- Calculate the draw extents
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local x1, y1, x2, y2 = 0, 0, width, height
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for _, h in ipairs(self._children) do
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local px, py, pwidth, pheight = matrix.transform_rectangle(h._matrix, h:get_draw_extents())
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x1 = math.min(x1, px)
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y1 = math.min(y1, py)
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x2 = math.max(x2, px + pwidth)
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y2 = math.max(y2, py + pheight)
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end
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self._draw_extents = {
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x = x1, y = y1,
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width = x2 - x1,
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height = y2 - y1
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}
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-- Check which part needs to be redrawn
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-- Are there any children which were removed? Their area needs a redraw.
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for _, h in ipairs(old_children) do
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local x, y, width, height = matrix.transform_rectangle(h._matrix_to_device, h:get_draw_extents())
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region:union_rectangle(cairo.RectangleInt{
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x = x, y = y, width = width, height = height
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})
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h._parent = nil
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end
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-- Did we change and need to be redrawn?
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local x, y, w, h = matrix.transform_rectangle(self._matrix_to_device, 0, 0, self._size.width, self._size.height)
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local new_x, new_y = math.floor(x), math.floor(y)
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local new_width, new_height = math.ceil(x + w) - new_x, math.ceil(y + h) - new_y
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if new_x ~= old_x or new_y ~= old_y or new_width ~= old_width or new_height ~= old_height or
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widget ~= old_widget then
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region:union_rectangle(cairo.RectangleInt{
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x = old_x, y = old_y, width = old_width, height = old_height
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})
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region:union_rectangle(cairo.RectangleInt{
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x = new_x, y = new_y, width = new_width, height = new_height
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})
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end
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end
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--- Create a new widget hierarchy that has no parent.
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-- @param context The context in which we are laid out.
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-- @param widget The widget that is at the base of the hierarchy.
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-- @param width The available width for this hierarchy.
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-- @param height The available height for this hierarchy.
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-- @param redraw_callback Callback that is called with the corresponding widget
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-- hierarchy on widget::redraw_needed on some widget.
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-- @param layout_callback Callback that is called with the corresponding widget
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-- hierarchy on widget::layout_changed on some widget.
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-- @param callback_arg A second argument that is given to the above callbacks.
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-- @return A new widget hierarchy
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function hierarchy.new(context, widget, width, height, redraw_callback, layout_callback, callback_arg)
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local result = hierarchy_new(widget, redraw_callback, layout_callback, callback_arg)
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result:update(context, widget, width, height)
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return result
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end
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--- Update a widget hierarchy with some new state.
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-- @param context The context in which we are laid out.
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-- @param widget The widget that is at the base of the hierarchy.
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-- @param width The available width for this hierarchy.
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-- @param height The available height for this hierarchy.
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-- @param[opt] region A region to use for accumulating changed parts
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-- @return A cairo region describing the changed parts (either the `region`
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-- argument or a new, internally created region).
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function hierarchy:update(context, widget, width, height, region)
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local region = region or cairo.Region.create()
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hierarchy_update(self, context, widget, width, height, region, self._matrix, self._matrix_to_device)
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return region
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end
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--- Get the widget that this hierarchy manages.
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function hierarchy:get_widget()
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return self._widget
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end
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--- Get a matrix that transforms to the parent's coordinate space from this
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-- hierarchy's coordinate system.
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-- @return A matrix describing the transformation.
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function hierarchy:get_matrix_to_parent()
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return self._matrix
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end
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--- Get a matrix that transforms to the base of this hierarchy's coordinate
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-- system (aka the coordinate system of the device that this
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-- hierarchy is applied upon) from this hierarchy's coordinate system.
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-- @return A matrix describing the transformation.
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function hierarchy:get_matrix_to_device()
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return self._matrix_to_device
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end
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--- Get a matrix that transforms from the parent's coordinate space into this
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-- hierarchy's coordinate system.
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-- @return A matrix describing the transformation.
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function hierarchy:get_matrix_from_parent()
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local m = self:get_matrix_to_parent()
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return m:invert()
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end
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--- Get a matrix that transforms from the base of this hierarchy's coordinate
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-- system (aka the coordinate system of the device that this
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-- hierarchy is applied upon) into this hierarchy's coordinate system.
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-- @return A matrix describing the transformation.
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function hierarchy:get_matrix_from_device()
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local m = self:get_matrix_to_device()
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return m:invert()
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end
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--- Get the extents that this hierarchy possibly draws to (in the current coordinate space).
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-- This includes the size of this element plus the size of all children
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-- (after applying the corresponding transformation).
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-- @return x, y, width, height
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function hierarchy:get_draw_extents()
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local ext = self._draw_extents
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return ext.x, ext.y, ext.width, ext.height
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end
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--- Get the size that this hierarchy logically covers (in the current coordinate space).
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-- @return width, height
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function hierarchy:get_size()
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local ext = self._size
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return ext.width, ext.height
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end
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--- Get a list of all children.
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-- @return List of all children hierarchies.
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function hierarchy:get_children()
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return self._children
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end
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--- Does the given cairo context have an empty clip (aka "no drawing possible")?
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local function empty_clip(cr)
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local x, y, width, height = cr:clip_extents()
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return width == 0 or height == 0
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end
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--- Draw a hierarchy to some cairo context.
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-- This function draws the widgets in this widget hierarchy to the given cairo
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-- context. The context's clip is used to skip parts that aren't visible.
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-- @param context The context in which widgets are drawn.
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-- @param cr The cairo context that is used for drawing.
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function hierarchy:draw(context, cr)
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local widget = self:get_widget()
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if not widget.visible then
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return
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end
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cr:save()
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cr:transform(self:get_matrix_to_parent():to_cairo_matrix())
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-- Clip to the draw extents
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cr:rectangle(self:get_draw_extents())
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cr:clip()
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-- Draw if needed
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if not empty_clip(cr) then
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local opacity = widget.opacity
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local function call(func, extra_arg1, extra_arg2)
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if not func then return end
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local function error_function(err)
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print(debug.traceback("Error while drawing widget: " .. tostring(err), 2))
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end
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if not extra_arg2 then
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xpcall(function()
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func(widget, context, cr, self:get_size())
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end, error_function)
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else
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xpcall(function()
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func(widget, context, extra_arg1, extra_arg2, cr, self:get_size())
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end, error_function)
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end
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end
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-- Prepare opacity handling
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if opacity ~= 1 then
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cr:push_group()
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end
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-- Draw the widget
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cr:save()
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cr:rectangle(0, 0, self:get_size())
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cr:clip()
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call(widget.draw)
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cr:restore()
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-- Draw its children (We already clipped to the draw extents above)
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call(widget.before_draw_children)
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for i, wi in ipairs(self:get_children()) do
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call(widget.before_draw_child, i, wi:get_widget())
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wi:draw(context, cr)
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call(widget.after_draw_child, i, wi:get_widget())
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end
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call(widget.after_draw_children)
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-- Apply opacity
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if opacity ~= 1 then
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cr:pop_group_to_source()
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cr.operator = cairo.Operator.OVER
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cr:paint_with_alpha(opacity)
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end
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end
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cr:restore()
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end
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return hierarchy
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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