QT 缩放以及还原原始大小

[{"title":"（ 10 个子文件 6KB ） QT 缩放以及还原原始大小","children":[{"title":"GraphicsZoom","children":[{"title":"main.cpp <span style='color:#111;'> 183B </span>","children":null,"spread":false},{"title":"drawscene.h <span style='color:#111;'> 292B </span>","children":null,"spread":false},{"title":"mainwindow.h <span style='color:#111;'> 519B </span>","children":null,"spread":false},{"title":"GraphicsZoom.pro <span style='color:#111;'> 463B </span>","children":null,"spread":false},{"title":"drawview.h <span style='color:#111;'> 299B </span>","children":null,"spread":false},{"title":"mainwindow.cpp <span style='color:#111;'> 1.28KB </span>","children":null,"spread":false},{"title":"mainwindow.ui <span style='color:#111;'> 1.72KB </span>","children":null,"spread":false},{"title":"drawview.cpp <span style='color:#111;'> 605B </span>","children":null,"spread":false},{"title":"GraphicsZoom.pro.user <span style='color:#111;'> 18.14KB </span>","children":null,"spread":false},{"title":"drawscene.cpp <span style='color:#111;'> 1.36KB </span>","children":null,"spread":false}],"spread":true}],"spread":true}]