insert operation fixing
delete operation fixing
drag-drop file to play
add right click menu
move MenuController to a single file
add menu_controller, some refactor stuff moving Titlebar to a single file
more refactor stuff
window resize done
drag support
add title bar and page changer support
add title bar and page changer support
add control bar
add pause notify image
playlist panel added
prevent play or pause from happening if we intend to move or resize the window
playlist show and hide behavior
fix some ui problems
ProgressBar drag click support
preview added
bugfix: window can't be moved correctly after resize