Jeremy Penner
cb5132f393
subrepo: subdir: "vendor/lite-plugins" merged: "de4227d" upstream: origin: "https://github.com/rxi/lite-plugins" branch: "master" commit: "de4227d" git-subrepo: version: "0.4.2" origin: "https://github.com/ingydotnet/git-subrepo" commit: "65fde50"
113 lines
4.1 KiB
Lua
113 lines
4.1 KiB
Lua
--[[
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dragdropselected.lua
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provides basic drag and drop of selected text (in same document)
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version: 20200627_133351
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originally by SwissalpS
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TODO: use OS drag and drop events
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TODO: change mouse cursor when duplicating
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TODO: add dragging image
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--]]
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local DocView = require "core.docview"
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local core = require "core"
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local keymap = require "core.keymap"
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-- helper function for on_mouse_pressed to determine if mouse down is in selection
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-- iLine is line number where mouse down happened
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-- iCol is column where mouse down happened
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-- iSelLine1 is line number where selection starts
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-- iSelCol1 is column where selection starts
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-- iSelLine2 is line number where selection ends
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-- iSelCol2 is column where selection ends
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local function isInSelection(iLine, iCol, iSelLine1, iSelCol1, iSelLine2, iSelCol2)
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if iLine < iSelLine1 then return false end
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if iLine > iSelLine2 then return false end
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if (iLine == iSelLine1) and (iCol < iSelCol1) then return false end
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if (iLine == iSelLine2) and (iCol > iSelCol2) then return false end
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return true
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end -- isInSelection
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-- override DocView:on_mouse_moved
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local on_mouse_moved = DocView.on_mouse_moved
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function DocView:on_mouse_moved(x, y, ...)
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local sCursor = nil
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-- make sure we only act if previously on_mouse_pressed was in selection
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if self.bClickedIntoSelection then
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-- show that we are dragging something
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sCursor = 'hand'
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-- check for modifier to duplicate
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-- (may want to set a flag as this only needs to be done once)
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-- TODO: make image to drag with and/or hand over to OS dnd event
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if not keymap.modkeys['ctrl'] then
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-- TODO: maybe check if moved at all and only delete then or
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-- as some editors do, only when dropped. I do like it going
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-- instantly as that reduces the travel-distance.
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self.doc:delete_to(0)
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--sCursor = 'arrowWithPlus' -- 'handWithPlus'
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end
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-- calculate line and column for current mouse position
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local iLine, iCol = self:resolve_screen_position(x, y)
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-- move text cursor
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self.doc:set_selection(iLine, iCol)
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-- update scroll position
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self:scroll_to_line(iLine, true)
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end -- if previously clicked into selection
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-- hand off to 'old' on_mouse_moved()
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on_mouse_moved(self, x, y, ...)
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-- override cursor as needed
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if sCursor then self.cursor = sCursor end
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end -- DocView:on_mouse_moved
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-- override DocView:on_mouse_pressed
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local on_mouse_pressed = DocView.on_mouse_pressed
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function DocView:on_mouse_pressed(button, x, y, clicks)
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-- no need to proceed if not left button or has no selection
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if ('left' ~= button)
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or (not self.doc:has_selection())
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or (1 < clicks) then
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return on_mouse_pressed(self, button, x, y, clicks)
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end
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-- convert pixel coordinates to line and column coordinates
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local iLine, iCol = self:resolve_screen_position(x, y)
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-- get selection coordinates
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local iSelLine1, iSelCol1, iSelLine2, iSelCol2 = self.doc:get_selection(true)
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-- set flag for on_mouse_released and on_mouse_moved() methods to detect dragging
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self.bClickedIntoSelection = isInSelection(iLine, iCol, iSelLine1, iSelCol1,
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iSelLine2, iSelCol2)
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if self.bClickedIntoSelection then
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-- stash selection for inserting later
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self.sDraggedText = self.doc:get_text(self.doc:get_selection())
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else
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-- let 'old' on_mouse_pressed() do whatever it needs to do
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on_mouse_pressed(self, button, x, y, clicks)
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end
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end -- DocView:on_mouse_pressed
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-- override DocView:on_mouse_released()
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local on_mouse_released = DocView.on_mouse_released
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function DocView:on_mouse_released(button)
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if self.bClickedIntoSelection then
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-- insert stashed selected text at current position
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self.doc:text_input(self.sDraggedText)
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-- unset stash and flag(s) TODO:
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self.sDraggedText = ''
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self.bClickedIntoSelection = nil
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end
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-- hand over to old handler
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on_mouse_released(self, button)
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end -- DocView:on_mouse_released
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