From b7b2834564ec78f4ba78826ce4a7343ddff21565 Mon Sep 17 00:00:00 2001
From: luoliangyi <87842688@qq.com>
Date: Tue, 24 May 2022 13:15:52 +0800
Subject: [PATCH] =?UTF-8?q?=E5=90=88=E5=B9=B6=E5=90=8E=E6=8F=90=E4=BA=A4?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/scanner/HGImgView.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/app/scanner/HGImgView.cpp b/app/scanner/HGImgView.cpp
index c34bf998..7f811e8b 100644
--- a/app/scanner/HGImgView.cpp
+++ b/app/scanner/HGImgView.cpp
@@ -8,6 +8,7 @@
 #include "base/HGInc.h"
 #include "imgfmt/HGImgFmt.h"
 #include "HGUIGlobal.h"
+#include <QApplication>
 
 HGImgView::HGImgView(QWidget* parent)
     : QWidget(parent)
@@ -997,6 +998,21 @@ HGResult HGImgView::zoomIn(const HGPoint *pCenter)
     float fNewWidth = fCurWidth * 1.2f;
     float fNewHeight = fCurHeight * 1.2f;
 
+    // support 1% zoom-in when 'ctrl' pressed (added on 2022-05-24)
+    if(QApplication::queryKeyboardModifiers() == Qt::CTRL)
+    {
+        // 1%
+        fNewWidth = info.width * .01f;
+        if(fNewWidth < 1.0f)
+            fNewWidth = 1.0f;
+        fNewWidth += fCurWidth;
+
+        fNewHeight = info.height * .01f;
+        if(fNewHeight < 1.0f)
+            fNewHeight = 1.0f;
+        fNewHeight += fCurHeight;
+    }
+
     if (fabs(fMaxWidth - fCurWidth) > 1e-3 || fabs(fMaxHeight - fCurHeight) > 1e-3)
     {
         if (fNewWidth - fMaxWidth > -1e-3 || fNewHeight - fMaxHeight > -1e-3
@@ -1063,6 +1079,21 @@ HGResult HGImgView::zoomOut(const HGPoint *pCenter)
     float fNewWidth = fCurWidth * 1.0f / 1.2f;
     float fNewHeight = fCurHeight * 1.0f / 1.2f;
 
+    // support 1% zoom-out when 'ctrl' pressed (added on 2022-05-24)
+    if(QApplication::queryKeyboardModifiers() == Qt::CTRL)
+    {
+        // 1%
+        fNewWidth = info.width * .01f;
+        if(fNewWidth < 1.0f)
+            fNewWidth = 1.0f;
+        fNewWidth = fCurWidth - fNewWidth;
+
+        fNewHeight = info.height * .01f;
+        if(fNewHeight < 1.0f)
+            fNewHeight = 1.0f;
+        fNewHeight = fCurHeight - fNewHeight;
+    }
+
     if (fabs(fMinWidth - fCurWidth) > 1e-3 || fabs(fMinHeight - fCurHeight) > 1e-3)
     {
         if (fNewWidth - fMinWidth < 1e-3 || fNewHeight - fMinHeight < 1e-3